Summary: Multi-project IDE builds sometimes fail with a compilation error message stating that identical types do not match.
Nearby: KnownBugsOrProblems, HomePage

Sometimes an type mismatch error may be reported when in fact the types not only match but are in fact identical. This has been traced to a problem related to how difficult "smart" recompilation (i.e. only recompiling the smallest set of modified code and those dependent on that code) is.

The current suggested workaround is to exit the IDE (Visual Studio) and then restart and continue your development. This usually works.