My only suggestion at this point is to compare the two environments and see what is the difference that causes the problem (e.g., a different IIS configuration, some changes in the web.config, etc.).
Of course, if you can attach to the IIS and debug there, this will help you hunt the problem down.
You can also try using your local IIS and attach a debuger to it, instead of the IIS Express (or Cassini) server that VS uses by default.
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