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The Xamarin.Android 4.10.2 beta installation is breaking iOS in Visual Studio. It's a beta so I know I'm living on the edge... just letting you know it happened :-).
I confirmed it is the beta that broke things by completely uninstalling all of Xamarin, did the standard install, created iOS and Android projects in VS w/ no trouble. Then installed the 4.10.2 beta and verify that iOS is now broken.
The problem is that when I try to view the Xamarin iOS values in the Options dialog or try to access/create an iOS project I get the error message "The 'MonoTouchPackage' package did not load correctly".
I checked the Visual Studio ActivityLog.xml and it contains the error
SetSite failed for package [MonoTouchPackage]
I have checked this issue and I am able to reproduce this issue. When I am having stable builds (MTVS 1.8.365, X.Android 4.10.1-73) and then I uninstalled stable X.Android and installed beta X.Android 4.10.2-5 and create iOS application getting dialog: http://screencast.com/t/PAnh4niL
Unfortunately, this scenario won't be supported. You'll have to use the corresponding Beta 1.10.19 iOS for VS build alongside the beta 4.10.2 Xamarin.Android.
We're currently working on merging the two VS extensions into a single installer to prevent exactly this type of mismatch in the future, but for now this one will be WONTFIX.
Thanks for the update ... using both Betas is a reasonable workaround. Thanks again.