I wanted to try Resharper 4.0 (final) but unfortunately the addin registration does not seem to work. The menu entry is there but all commands are greyed out. The Addin does not appear in the AddIn Manager although all settings seem to be correct (I have cross-checked the settings with the installation on my notebook where everything seems to work fine). Also the installation itself completed successfully and the .addin file was deployed correctly to the addin folders.
There seems to be a general problem with xml based addin registrations (e.g. I cannot install GhostDoc either) while old COM based plugins like VisualSVN are working fine.
I have found some information on a similar problem in VS2005 which was eventually fixed with the VS2005 SP1 but no information concerning VS2008.
I am using VS2008 Pro (English) on WinXP Pro SP2 (English).
Is there any solution to this problem for ReSharper 4.0 or xml based addins in general?