Believe me, I have searched everthing I could think of. I don't just post because I am lazy.
What kind of driver do you have in mind? The graphics driver I suppose. But why then none of my other applications shows this problem?
Because that's how bugs are. It might work with everything but MC and still be a video driver bug.
I'm sorry you have the problem, but as you describe it, I can't see how it's a JRiver bug.
In my signature, there's a link to Weird Problems. Take a good look there and see how many times these JRiver problems turn out to be caused by other software.