I was about to send in this report earlier, but instead I tried reinstalling studio, restarting and just giving it some time. I’m still getting this bug for a while now, but randomly - sometimes it happens, sometimes it doesn’t.
The above is a screenshot after I opened a project (Is not related to a specific project) and then opened and closed a script. The “Play” button along with the “Run” option becomes greyed out and I can no longer test my game on that studio session.
I’m running Windows 8.1