Larry:

Do you place your BO assembly in the GAC or is it just on disk?  If you have things stored in the GAC, the AppDomain in the development environment acts a little different.  Generally in this case you have to build your assembly and let it get added back to the GAC, then get out of VS, come back in and it will load the NEW BO assembly.

Hi Trent,

Thanks for the info. The BO is just on disk. Since it was just happening to this one object I'm writing it off as a VS 2012 quirk. If it happens again I'll spend more time on it.

-Larry