I have had scheduler problems but it may be related to the machine it is on. I can close it and restart it and it usually clears what ever was wrong. Can't get it to have the issue consistently either so I haven't really bothered trying to figure it out. Pretty minor inconvenience actually. It will start popping up message boxes that say it had difficulties with opening the com port, but then open them fast enough that you can't do anything before it opens another three or four. I just crtl alt del and end the process. Always has done it just as the scheduler was opening as well. Once it was going, it worked, but if you updated something in the show and restarted the scheduler it would have a chance of starting the com port message boxes. Maybe the port was still open and hadn't updated yet in the system?