I have the same issue. I stopped using Foxy Tunes because of this.
My guess is that this is a Foxy Tunes issue, not an MC issue. Assuming that is correct, I would not expect the JRiver team to try to fix it.
I suggest you report it to Foxy Tunes. If they fix it, let us know. I'm sure there is more than 2 of us having this problem.