Most likely just a simple permissions issue.
http://support.progressionstudios.com/discussion/comment/55#Comment_55

The files have been out for months, no bugs or anything like that. Easiest way to debug is to visit the image linked. TimThumb will actually give you a good idea on errors if there are any.

changed permissions of \Broadside\cache\ and \Broadside to 777 but still not showing any backgrounds :(

My provider dont blocks scripts or anything ...

Can you post a link to the image or site? I'll check it out.

http://www.romantiker.at/

the crazy thing is: with the old theme it works fine!

http://www.romantiker.at/wp-content/themes/Broadside/timthumb.php?src=http://www.romantiker.at/wp-content/themes/Broadside/images/backgrounds/startseite.jpg&w=980&h=600

Follow the directions of the error. Just create a blank index.html file in your /cache folder of your theme files. wp-content/themes/broadside/cache

Chances are that should fix it :-)

Send your hosting provider an e-mail and ask them for help if you still have any trouble.

it has nothing to do with my provider! - it is an error with timthumb or anything .. there is already an index.html in both folders :(( can you not solve the problem? this is really bad

why is the old theme working? there is something changed so that its not working anymore :(

Private message me FTP information and I will check it out.

TimThumb tells you how to set anything up if there are problems as I mentioned a few times above: http://www.romantiker.at/wp-content/themes/Broadside/timthumb.php

Also, your hosting provider could fix this in minutes.

I have the same problem. Got fix?

Post a link to your site. It's best just to visit the image link and TimThumb will tell you the issue.

Redworx issue was the old cached images were being rejected by the hosting provider. Once he deleted the /cache folder and replace it with the new one from the download it worked fine.

My site link is www.feizertools.com.br/wordpress. The Slider dont work. Can you help me?

http://feizertools.com.br/wordpress/wp-content/themes/Broadside/timthumb.php?src=http://www.feizertools.com.br/wordpress/wp-content/themes/Broadside/images/backgrounds/blog-background.jpg&w=980&h=500

Follow the error message as it tells you how to fix and/or just contact your hosting provider and they will sort this out in minutes.

empty html page exist

Hi mike, my hosting provider said.
"For your hosting, it's alright with it. I performed a search on the web where apparently the plugin is compatible to Wordpress in version 3.3.1 and your Wordpress uses version 3.4.2."

Mike, Can you help me with this problem? If not can, my purchase of themes will not make sense, because it does not work as I'd like.

Not sure what your hosting provider is referring to as you are using a Theme not a plugin? Also, TimThumb is a PHP script not a plugin and doesn't rely on any version of WordPress.

You can use all our themes with the latest WordPress. It sounds like you are getting the run-around by your hosting provider. This is something that should be sorted in out in minutes, not weeks. Feel free to send me a private e-mail via my profile page contact form:
http://themeforest.net/user/ProgressionStudios#from

I can offer quicker responses that way in this case. I would keep trying with your hosting provider support (Maybe try over the phone) to get somebody else on the case. I've heard many buyers have bad-luck with certain support people but randomly calling and getting somebody more/less helpful.