Hi Jason Maronge,
Here is two things you can try:
1. Start a Windows Explorer instance and navigate to the following folder:
and delete if there is anything there (some project assemblies might be cached there)
2. Add in GAC the assemblies that you want to use if they are not there
Also, are you converting or converted this project from SL3. If the above steps does not help, could you please send us a project where the error is reproducible so we can debug it as I am having problems to reproduce the bad behavior at our side.
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