Hi Dean,
I am license administrator for a site license at a University. I use Mathematica for teaching and research. In my classes many hundreds of students have used Mathematica on many different types of computers and setups. I have not yet heard of that issue. I cannot reproduce it either. So I would say that this is not a common issue.
What exact OS are you using? Are you using Mathematica 10.0.2?
Cheers,
Marco