Yesterday evening, we released MonoTouch 5.2.5 and MonoDevelop 18.104.22.168 with support for Xcode 4.3 to our beta channel. This enables you to have Xcode 4.3 installed in the Applications folder and continue to use MonoTouch.
Since Xcode 4.3 takes with it a few command line tools and relocates them, MonoTouch 5.2.5 and MonoDevelop 22.214.171.124 are reconfigured to pick up these new locations so you can be up and running again as quickly as possible.
Removing Old Xcode
It’s important to note that installing Xcode 4.3 will ask you if you want to delete your existing installations of Xcode (taking with it the /Developer folder). What you may not know is that MonoTouch and Mono for Android (for Mac) get installed into this folder too. If you choose to remove Xcode 4.2, you will need re-install MonoTouch and/or Mono for Android. Alternatively, you can keep your existing Xcode 4.2 installation and things will continue to work as expected.
Please let us know if you run into any problems with this release. If you do run into problems, feel free to e-mail us at firstname.lastname@example.org