mono/MonoGame — pull request #900 by Nezz (2012-10-21 18:31:11+00:00)
Title: Fixes sensor delay issues related to blocking main thread

After discussion this with xamarin over and over, I think that this is the best workaround we can find.
In general, the issue is that if we do something to block the main thread (like loading content), our sensorchanged events get delayed for a few seconds. Then they will catch up. But in the meantime, it will look something like this:
http://www.youtube.com/watch?v=8UFRDGMIrlw

I also moved the motionmanager to be static across the sensors (another xamarin recommendation).