I am testing using Mac OS in DW CS4 and 5.5.
after installing:
Paypal eCommerce Toolkit 4.5.4
Payment Buttons for Paypal 1.0.0
eCart 5.0.6
Design Extender 1.0.9
Data Bridge 1.0.5
I am not able to reproduce the error
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.