MonoTouch upgrade error (OS X Mountain Lion): logged-in user is not an administrator, but has provided admin credentials to elevate when requested. still fails due to authorization issues?

gistfile1.txt

13/01/13 8:30:57.584 AM Xamarin Update[57413]: Reading index file
13/01/13 8:30:57.586 AM Xamarin Update[57413]: Loaded 2 updates from index file
13/01/13 8:30:57.587 AM Xamarin Update[57413]: Requesting root authorization
13/01/13 8:31:02.113 AM Xamarin Update[57413]: Acquired root authorization
13/01/13 8:31:02.114 AM Xamarin Update[57413]: Updates require restart, terminating MonoDevelop and related apps
13/01/13 8:31:02.139 AM Xamarin Update[57413]: Installing update 1 of 2
13/01/13 8:31:02.139 AM Xamarin Update[57413]: Attaching disk image '/Users/jim/Library/Caches/MonoDevelop-3.0/TempDownload/a3140c14-ef90-4019-ae6c-9d93804d6611-30006000.dmg'
13/01/13 8:31:02.140 AM Xamarin Update[57413]: /usr/bin/hdiutil attach '/Users/jim/Library/Caches/MonoDevelop-3.0/TempDownload/a3140c14-ef90-4019-ae6c-9d93804d6611-30006000.dmg' -mountrandom /tmp -nobrowse -plist
13/01/13 8:31:03.480 AM Xamarin Update[57413]: Installing application '/private/tmp/dmg.gM65bv/MonoDevelop.app'
13/01/13 8:31:03.480 AM Xamarin Update[57413]: Found app to be updated: '/Applications/MonoDevelop.app'
13/01/13 8:31:03.481 AM Xamarin Update[57413]: Getting temp name for old application
13/01/13 8:31:03.482 AM Xamarin Update[57413]: Found name: MonoDevelop (old).app
13/01/13 8:31:03.482 AM Xamarin Update[57413]: Moving old app out of the way
13/01/13 8:31:03.482 AM Xamarin Update[57413]: /bin/mv '/Applications/MonoDevelop.app' '/Applications/MonoDevelop (old).app'
13/01/13 8:31:03.485 AM Xamarin Update[57413]: Error moving old app: Error Domain=NSOSStatusErrorDomain Code=-60002 "The operation couldn’t be completed. (OSStatus error -60002.)" (errAuthorizationInvalidRef: The authorization parameter is invalid. )
13/01/13 8:31:03.485 AM Xamarin Update[57413]: Detaching disk image '/private/tmp/dmg.gM65bv'
13/01/13 8:31:03.485 AM Xamarin Update[57413]: /usr/bin/hdiutil detach '/private/tmp/dmg.gM65bv'
13/01/13 8:31:03.551 AM Xamarin Update[57413]: Update failed to install
13/01/13 8:31:03.551 AM Xamarin Update[57413]: Skipping remaining 1 updates
13/01/13 8:31:03.552 AM Xamarin Update[57413]: Error Domain=xamarin.updater Code=-1 "Error installing application." UserInfo=0x10053a250 {NSLocalizedDescription=Error installing application.}