I just installed a software update that I was prompted for, presumably affecting Xcode. Now when I start Xcode, I am presented with a dialog box which states that Xcode must install the Mobile Device Framework before continuing. When I try to do this, after providing my password, it fails with "An unknown error occurred. See the install log for more details." I do not see anything useful in install.log that identifies the problem. I've tried re-installing multiple times and rebooting to no avail.
I'm currently running Xcode 4.3. Perhaps I need to upgrade to 4.4? Has anyone else run into this problem?