Issues with timthumb.php image resizing script

Hi everyone,
I’m not sure I’m posting in the right place but here goes anyway… (sorry if I am)

I am designing a wordpress site (https://dcs2.ttecs.com.au) and the theme I am using utilises the timthumb.php image resizing script. For the life of me I cannot get it to work. I have so far…
1. Updated to the latest timthumb.php script
2. Changed the permissions on my cache and timthumb.php files to 777
3. Asked my theme provider for help (takes forever and I don’t have forever!)
But I am still getting a broken link image… the odd thing is if you click on the broken image the file shows correctly!

If I right click on the broken image and open the file in a new window I get the following error code –
The requested URL /wp-content/themes/AppMaker/script/timthumb.phpsrc=https://dcs2.ttecs.com.au/wp-content/uploads/2012/03/stock-photo-17056512-young-warehouse-businessman-with-laptop1.jpg was not found on this server.

I have noticed that other sites using timthumb have a question mark inbetween the .php and the src… I have no idea how to fix this… can anyone help??