Issue displaying customy webcontrols in designtime defined within another project

[Stefan Uhlemann]

Hi,

Since i have installed VS 2008 SP1 (and .NET Framework 3.5 SP1) there are
strange issuses and errors displaying my webcontrols.
If i recompile the second project (with the controls) - the main project can
not display any of the controls anymore (Small gray window with red error
message).
I have to close the whole solution, change the version number of my second
project (dll), recompile it, open solution and it works until i
change/recompile my second project (DLL) and same error appears...

Any ideas?

Thanks

Stefan