The latest Xamarin Update seems to break some functionality related to reflection in the IKVM/Mono port we use. See this issue and this issue, I do not have the time to look into this matter at the moment, as my day job is rather busy, and i need to use my spare time to recharge batteries.
I’ll look into it over the next month. Michael Bayne of PlayN fame will also eventually look into it, though he’s currently occupied with changing diapers 🙂 I promised to give it a shot first, not to sure i can fix up things. My work on IKVM/Mono has been primarily on the JNI stuff.
If you bought a license, you can approach Xamarin and ask them to let you downgrade Xamarin.iOS to an earlier version. This reportedly fixed some issues for folks on the PlayN list, and is likely to fix issues for us libgdx folks as well. You can get a downgraded version of Xamarin.iOS here: http://download.xamarin.com/MonoTouch/Mac/monotouch-220.127.116.11.pkg
We have some other really exciting news coming up in about a month from now which involves our iOS strategy. I’m under NDA and can’t really give any details, so bear with me 🙂