This happens to me too, but only when running under Vista. I have similar setups of firefox on both a XP and Vista Machine. Both have the same firefox version (2.0.0.11).
Following AddOns are installed on both firefox instances:
AddBlock Plus 0.7.5.3
DownThemAll 0.9.9.10
The only difference is Vista and XP. Under XP Firefox indicates the following in the about box:
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11
in Vista it is slightly different:
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11
running in vista in compatibility mode (Windows XP - SP2) it is identical to under normal XP (except for the locale):
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11
For some reason the community works under the XP system, but will not work under the Vista setup. Same 'Bad Request' message as the starter of this thread mentioned.
Is there anything that can be done about this ?
Greetings,
Dennis