Visual Studio 2008 switches active project in solutions

Question

I don't know how it happened, but for about a week now Visual Studio keeps switching the active project everytime I move between files (of different projects) in the same solution. Of course when I press F5 to start debugging or Ctrl+F5 to run the tests, it tells me that it can't start because the class library can't be started directly... It switched the active project again.

This is driving me nuts and I can't find a setting to turn it off. I've got the following addins installed:

• ReSharper 4.5
• TeamCity
• AnkhSVN 2.0.something (latest)
• GhostDoc
• Gallio

I've enabled and disabled the Track Active Item in Solution Explorer option, but that didn't help.

Anyone an idea?

Thank you!

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Updates:

• I checked the ProjectGuid as suggested by sharptooth and all projects have a unique guid.

Answer 1

Right-click on your solution in Solution Explorer, select Common Properties - Startup Project in the treeview to the left and then adjust radiobuttons to the right as needed:

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