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When using non-fast deployment, the F5 action does not always deploy the APK on the device/emulator, which makes the debugging session silently use the previously deployed APK.
Deleting the APK in the output directory might deploy it, sometimes. Some other times, manually uninstalling the app might fix it temporarily.
This is a new issue to 4.0.
Happened to me, too.
We've seen such behavior if the device date time is ahead of the development machine. Can you guys please confirm if that was causing the issue in this case?
Resolving as Answered.
If you're still facing this issue with current bits, please feel free to reopen the bug.