This is definitly no versioning problem, because the version numbers are not incremented. Assembly A has one static version number and exists only one time on my hard disk. The loaded assemblies in AppDomain show identical Version numbers, Names, Cultures, PublicKeyTokens and CodeBase. I cannot understand why they are loaded several times (I've also seen more than 2 when working with the same Visual Studio Instance for a longer time). Closing the solution doesn' t unload these assemblies. This implies several problems with type checking in Custom designers
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