Try changing your skin to see if that makes any difference. Which was your previous version of FW? If not work, then check out the following ideas.

Try deleting your FW preferences folder whilst FW is closed. How to delete your FrostWire Preferences folder

Other thoughts, see The way to fix the Blank screen on startup

What does it all mean? It looks like a Java issue. But it may be Java interacting with your graphic card or a java bug or ... FW interacting with a graphic card driver. If it's possible, change the resolution setting for your monitor & see if that makes any difference. You may need to re-open FrostWire for it to have an effect. ie: if your monitor is set to 600 x 800 then change it to something different, perhaps a larger setting. See if there's any difference.