The error is
"Error in Mememnto [sic] panel initialized UI:
Reference Error: wa is not defined."
Sorry for the delay in responding - I failed to subscribe to the thread!
The error pops up actually 4 times before I can get it off my screen.
When I try to remove Memento in the WA Preferences, I get this error message:
At line 312 of file "C:\Program Files (x86)\Adobe\Adobe Dreamweaver CS5\Configuration\Commands\WA_Preferences.htm": wa.user_interface has no properties