Hi Paul. mobdegub.coro() does not work. However, calling mobdebug.on() inside that callback did work. The strange issue is that I'm not using coroutines. Everything is running off the main thread. However, when I run this script under the debugger, the assert at line 5 fails. If I don't use the debugger, everything works fine. 1: setInterval(function() 2: assert(coroutine.running() == nil) 3: console.log("%s", os.time()) 4: end, 2000) 5: assert(coroutine.running() == nil) 6: process:loop()