This seems to be happening to me more and more often lately - I've been working on an Android class when all of a sudden it refuses to compile because of a missing reference (that it didn't complain about 2 minutes before when I ran it up in an emulator).
I've cleaned the solution, restarted Visual Studio and rebooted the PC. I tried to open it up in Xamarin Studio but is complains saying "version string portion was too short or too long".!
Does anyone have a solution for this? I'm spending way too much time fire fighting these issue when I should be coding - it's becoming really frustrating!
(I should point out that there are other Android classes in the same solution that are building without any problem!)