When we add a reference to System.Core, we find an issue which related to managed class String^. If we turn off the Precompiled Headers, any use of String::Format() always causes the crash. Also in another class that did some string marshalling it causes a crash in the msclr\marshal.h file on line 49. This problem can be reproduced using VS2008, VS2010 (Toolsets V90) with .Net Framework 3.5.
Visual Studio/Silverlight/Tooling version
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