There are three machines, without internet access, upon which this problem has been occurring. Each time that the problem has occurred, I have had to restart the computer between 1 and 3 times before successfully starting MediaLab (so, roughly 1-3 times of 10 this problem occurs).

We have one other machine that does have internet access which I have been using to create experiments. I have never had this application problem on the internet-capable machine.