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problem arises whether or not the emulator is already running:
1) build project in XS (any ole project will do)
2) hit F5, or click 'debug start' button
3) deploy to device goes as expected
4) application title-bar appears on emulator and application output reports:
Forwarding debugger port 8889
Forwarding console port 8890
Detecting existing process
5) status field at top of XS screen continues to show animated plug going toward string "Xamarin Studio"
6) application is unresponsive; no breakpoints are ever hit
7) clicking on emulator brings up message "Sorry!" + "Activity x (in application y.x) is not responding."
Buttons: "Force close" || "Wait".
8) waiting turns out to be infinite (XS is still showing that animated electric plug.)
If, at this point, you choose "Wait", and terminate the debugger in XS, the application continues to sit in the emulator, as if it's in some start-up loop somewhere. Clicking on it again brings up the same "Sorry!" messagebox.
After closing the app in the emulator and ending the debug session in XS, if you then click on the app, you get the same behavior: waiting and the "Sorry!" message.
IF, HOWEVER, you choose "Run => Run with" and pick the emulator, it rebuilds the project, deploys it, and it runs without a problem. Application output is "[monodroid-gc] GREF GC Threshold: 1800".(When you do this the menu option "Run => Start debugging" is grayed out and the start/control button [XS upper left] is reset to its "stop debugging" image, which, if you click, has no effect on the app running in the emulator. However, the debugger has not been started, so why XS thinks it can stop it...)
This appears to be a newly introduced conflict with avast! Internet Security antivirus package over port security. I'm not sure whether the change was from you or from them.
I'm debugging again, so you can put this on record--if I can get more info to you, I'll tack it onto this message stream.
This bug was targeted for a past milestone, moving to the next active non-hotfix milestone.