I have a .net assembly that is COM visible which works fine to call
CreateInstance() on in XP.
In Vista however CreateInstance() fails with class not registered for
some reason.
I register it with RegAsm /codebase and if i look in the registry it
is there.
Still CreateInstance() fails and i have no clue to why.

To make things even stranger the darn thing did work the first time i
registered it.
Then i made some modifications to the .net class and after that no
matter what i do i cannot create an instance of it.

I have tried reverting the changes, changing guids, changing assembly
version, creating a new assembly identical to the first working one
etc, still CreateInstance() keeps failing.
Anyon how a clue to where the problem might be?

/Magnus