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What exactly happened to your site?
Were files deleted? Were Showkase pages changed? Do you have any other files on your web space (not related to Showkase) that were affected in some way?
Without knowing all the details, it is difficult to know exactly what happened.

It is possible that it was your web hosting account itself (rather than your Showkase site specifically) that was compromised.
If this is the case, then it is possible that other sites on the same web host were also affected. You could try contacting your web host to ask them if there was a recent security breach (though they may be reluctant to divulge such information if they did experience such a problem).

The best advice I can give is to use strong passwords (long passwords with a mixture of uppercase and lowercase letters, numbers and punctuation) and that you use a different password for each and every service you use.

Even if a password is stored on a web server in an encrypted form, there is a possibility that it can be discovered if it is just a common word. For example, if your password for a service is 'Password1' and it is stored on a web server as a SHA1 hash, then if someone somehow got hold of this hashed password (which in itself may not be easy), all they would see is the text '70ccd9007338d6d81dd3b6271621b9cf9a97ea00'. However, because 'Password1' is a very weak password and is probably used quite often, there is a record of its hashes on the internet (see Rainbow tables for more information) and a simple web search of '70ccd9007338d6d81dd3b6271621b9cf9a97ea00' reveals that it is the SHA1 hash for the text 'Password1'. The more obscure your password is, the less likely it is that the internet will have a record of its hash (and that it can be found on Google) and the less likely it is to be discovered by a brute-force attack.

I do not know how your web host handles the storing of its own passwords but Showkase uses a more secure method than just hashing a password. A salt is also used so I think it is very unlikely that someone discovered your Showkase password and hacked your web site this way.

@iblauw

After uploading images for a gallery, go to the 'Images' tab, scroll down to the bottom of the page, select the 'Select all captions' checkbox, enter {file} in the 'Set selected to:' text field and click the 'Set' button.
This will set all image captions to be the filenames.

Please see the 'Editing Individual Captions' section in the Pages Menu support section for further details of other special codes which can be used for the image titles and captions.

By default, all browsers cache web pages unless otherwise specified (by the browser settings or the web page).
Showkase pages do not inlcude any code to influence the browser's decision as to whether or not the pages should be cached.
If you make any changes to your web page whilst your browser is still open, you may need to clear your browser's cache before reloading your web page to see the changes you have made.

Browsers usually do not cache between sessions (the opening and closing of a browser window being a session) so users who view your web site are unlikely to experience any caching issues. Each time they open a browser to view your web site, the browser should fetch the most recent files from your web server.

Are you using a 3G connection? If so, please see this FAQ:
Why can't I view my gallery on a 3G mobile connection?

A solution to this problem would be to create an .htaccess file containing the following code and upload it to your website's root directory. (Please note that this requires an Apache web server.)

<IfModule mod_headers.c>
Header set Cache-Control "no-transform"
</IfModule>

This should prevent content modification on your site when visitors view your galleries over a 3G connection.

You could also contact your 3G provider to see if it is possible for content modification to be turned off on your account (although this will help only when you view other people's galleries and will not solve the problem of other people viewing your own galleries over their own 3G connections, which the solution above tackles).

If this is not the problem and your gallery still does not display, then it is possible that the browser is timing out whilst fetching the gallery files from your web server. Try contacting your web host to see if they can increase the connection time out limit.

I'm glad everything is working as it should.
Thank you for posting back to let me know.

This is perfectly normal and is how Showkase works.
Each and every page you create in Showkase (including the page you choose to use as your home page) is given its own folder (in your root Showkase directory) and you can view each page by going to the 'index.html' page within the folder. (This is what happens when clicking a link in a page's menu.)
When a user navigates to the Showkase root directory itself, the 'index.php' file there displays the page you have chosen to use as your home page (the page with the lowest 'Nav Order'). (The home page is not actually duplicated. It is the content from the home page folder's 'index.html' file which is being displayed.)
In doing so, it is possible to quickly and easily change the home page in a Showkase installation without the need to restructure the entire web site.

This may be difficult to achieve. Even if you were to introduce the column-width CSS property (in your current theme's 'custom.css' file), its value "is not a absolute value but a mere hint". Please see this web page for details. It may not be easy to set all the required values to fix a column width without breaking the layout of the page.

As long as you are in 'Source' input mode, either of the following should work fine:

This is <b>bold</b> text.
This is <span style="font-weight: bold;">bold</span> text.

For reference (and others reading this thread), instructions for moving a Showkase installation can be found here.

It looks like you have successfully moved your installation into your root directory. Your site seems to functions fine with all the files in their new location (other than the 'index.php' home page).

The problem seems to be with your web server's PHP installation.
Going to your 'index.php' home page or your 'admin/index.php' login page, your web server does not process the PHP page as expected but serves it up to the user's browser as a download instead (a default action for a file it does not know what to do with).
It looks like either PHP is not currently installed (or configured correctly) on your web server or there is perhaps an incorrect or missing MIME type for PHP files. In either case, your web host should be able to help you further with this.
Once this has been resolved, your Showkase installation should function completely.

The forum does not allow images to be posted.
If you want to share a screenshot, please upload it to your own web server or a file-sharing service such as Dropbox and post a link to it.

The forum also does not allow links to be included in a user's first post as an anti-spam measure.
If a user really needs to post a link in a first post, it can be disguised as follows:
http://www.example.com -> www (dot) example (dot) com

However, as this was not your first post, you should have been able to post links.
I have checked the forum settings and all looks to be OK.

The gap you refer to is the lower part of your Juicebox gallery.
If you set imageVAlign="CENTER" rather than imageVAlign="TOP", then the gap will be reduced (the main image will be vertically centered in the gallery's image area rather than aligned to the top, which leaves a noticeable gap at the bottom).
Your gallery also uses the default value for imageScaleMode ('SCALE_DOWN') so images smaller than the gallery's image area are not scaled up to fill it. Try either feeding your Juicebox gallery larger images (so that they are always large enough to have to be scaled down and fill the image area either left-to-right or top-to-bottom, depending on their aspect ratio) or set imageScaleMode="SCALE".
Another solution might be to reduce the height of your Juicebox gallery in 'Site -> Customize Theme -> Gallery Pages -> External Fit px'. Enter a negative value to reduce the height of the gallery.

You could include your dynamic image into a Showkase 'Basic' page by loading its web page into an iframe.
For example, you could add code such as the following into a 'Basic' page's text editor in 'Source' input mode (adjusting the dimensions as necessary):

<iframe src="http://djphoto.com/work1/need_advice/ver4.html" width="800" height="400" frameborder="0" scrolling="no"></iframe>

Alternatively, Juicebox displays animated GIFs so you could perhaps create an animated GIF out of the three frames of your dynamic image and include it in a Juicebox gallery.

It sounds like your web host has set a resource limit (the maximum amount of memory that a script is allowed to allocate) of 16MB via the PHP 'memory_limit' configuration option (in your web server's 'php.ini' file).
If you have access to this file yourself, try increasing the 'memory_limit' value. If not, then contact your web host to ask if they can do this for you.
Otherwise, ensure that your images are less than 16MB each and try adding your images in smaller batches.