Eric thanks for your quick response. I followed the instructions very carefully. The new en_US folder was created OK and the installation of the only 2 extensions I have so far (FB and UE) installed as expected (only UE asked to "select 'yes to all when asked about overwriting existing files).
1) When I tried to run FB I got "Error initializing UI. Type error: group object has no properties" I have seen this error reported elsewhere in groups...
2) Still do not see the webassist code generation progress box as it was when I first installed the first Webassist extension (FB)
I followed the instructions again just to make sure that the "extension managers cache" had been wiped.
I have spent many hours trying to fix this on my own and with your assitance - I would appreciate a support ticket as I have clients waiting for HTML secure forms