I guess I’ll never know what actually caused this but renaming the project then creating a new one from scratch, adding everything back in and rebuilding it did the trick!

Over the years I’ve seen this type of thing happen once or twice. Visual Studio .sln files etc can be quite hairy and when something like this occurs, it’s often the easiest way.

I can still use it to edit and build manually on the Mac but it’s a pita. My software is uptodate (this happened after the last big upgrade), my PC and Mac are paired. The project compiles ok on the Mac.

But compiles and attempts to debug on Visual Studio all just output this and nothing more:

1>—— Build started: Project: TMRTaxi, Configuration: Debug iPhoneSimulator ——
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

I suspect that this in the mbtserver log is to blame…

[05-Dec-2013 17:47:08] Activation error: Built request for POST to https://activation.xamarin.com/api/studio.ashx?token=1a6….. (shortened)
[05-Dec-2013 17:47:08] Activation error: Executing request -1080599872.
[05-Dec-2013 17:47:11] Activation error: Wrote request stream for request -1080599872.
[05-Dec-2013 17:47:13] Activation error: Got response 741550592 for request 741550592.
[05-Dec-2013 17:47:13] Activation error: Reading response 741550592.
[05-Dec-2013 17:47:13] Activation error: Read response stream for response 741550592.
[05-Dec-2013 17:47:13] Activation error: Updated license: iOS Business 05/06/2014 14:43:26

Very frustrating!