Brief.
We have issued a patch of the 'admin_payment_system.html' file after release 3.3 has been issued.
 
Description.
There was a JavaScript error when adding an image for the payment systems.
 
Solution.
Please download an updated version of the file from here:
http://www.viart.com/downloads/admin_payment_system-3.3.zip
Then extract the file ''admin_payment_system.html' into the templates/admin/ folder of your shop replacing an existing one. Don't forget to make a backup copy of the current file in case something goes wrong.