Even after installing New ECart, New DataBridge and New Design Extender I still have that error. These are the only other extensions I have installed, perhaps there is also a problem with one of them?
These are all latest versions:
Tools for Google
Paypal eCommerce Toolkit
Search for Boss
Validation Spry Tooltips
Jeffrey Zeldman's Web Standards
BTW thanks so much for coming out with the combined extensions - it is so nice to have on verses several extensions to use! Still would love Poer Gallery somehow incorporated into Design Extender as that seems a huge limitation in functionality :-)