I am having this issue on many computers. We purchased a license for 20 computers and are having this issue as well. It seems to be a network related issue as I just noticed it to happen on my laptop when I am logged into our network while it did not happen when I was logged in workstation only. Very curious. Mr. Isaacs P.S. Support has not been so 'supportive' as we've been having a number of issues trying to get 8.1 Standard (licensed) working on our computers. I am a teacher and use game maker extensively with my students.
It happens on my school network too. The server they use to authenticate it may be blocked at your school. If it's already been upgraded to Standard, then disabling the internet connection to start Game Maker then re enabling it works. Not sure if that's possible on your school computers.
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