Bug Purchase button not working

Ever since I upgraded from the beta version (think it was b2.5.0? or something), the Purchase buttons have been broken.
I provided the URL to the shop and made it so unregistered users can see the shop, however, if you need sensitive details, such as FTP/AdminCP, I can provide via PM. Additionally, if you need to know anything else, please let me know. You may have to register to try to see the bug when pressing Purchase. Basically, it's as if the button doesn't do anything. You can click Purchase 100 times and it doesn't update the cart.

Here is a copy of 2 errors I reported from Mozilla Firefox

Timestamp: 2/28/2013 3:15:36 AM
Error: ReferenceError: $ is not defined
Source File: myforum.com/forums/dbtech/vbshop/clientscript/vbshop.js?v=302
Line: 2

Timestamp: 2/28/2013 3:15:36 AM
Warning: An unbalanced tree was written using document.write() causing data from the network to be reparsed. For more information https://developer.mozilla.org/en/Optimizing_Your_Pages_for_Speculative_Parsing
Source File: myforum.com/forums/vbshop.php
Line: 717

This appears to be a problem with your dbtech_vbshop template. Has it been customised? If so, please try reverting the customisations.

If not, please try re-downloading and re-uploading all the files - you may have missing code in the /dbtech/vbshop/includes/class_core.php file especially.

Fillip H. said:

This appears to be a problem with your dbtech_vbshop template. Has it been customised? If so, please try reverting the customisations.

If not, please try re-downloading and re-uploading all the files - you may have missing code in the /dbtech/vbshop/includes/class_core.php file especially.

Click to expand...

Thanks, but it is still not working. Could I PM you with ACP and FTP?

Sure

I have a bit of a backlog to take care of right now, so I might not get to it within the hour, but I'll have it fixed by the end of the day at the latest

Update: Fixed, t'was a Lite-and-vB3-only issue