After I updated Xcode to 7.3 I am unable to start debugging with AppCode 3.3.2 & 3.3.3 I am just able to Run without debugging each time I start debbuging with appcode this happens in the console:
/Users/labib/Library/Caches/AppCode33/DerivedData/TestApp-e195af2c/Build/Products/Debug-iphonesimulator/TestApp.app
Stopping simulator session...
Simulator session started with process 3047
Process finished with exit code 0
JetBrains is aware of this issue and have a fix as part of the current RC (see their latest AppCode blog post).
Their current advice is essentially to download the RC version from their AppCode EAP page if you've already upgraded to XCode 7.3. NOTE: It does require a license or you can use a 30 day eval period.