the problem is that I can't cancel a download. That is the cause of Frostwire hanging.
The side-effects are:
1. when I start frostwire it shows the "not connected" sign, but is working just the same
2. When I download something, the progress indicator doesn't work. It is only updated when I push one of the buttons under the download-screen.

Removing the incomplete-map didn't work.

So, what next?????