Again, I would have to admit that I have no idea what this is since I only use Mac although I believe that updating java may fix the problem.
Sub-Update (A few hours later):
The latest windows version has been confirmed to work, although there were a few reports that it does not. During this test, it has been discovered that it may not be necessary to add the ".png" extension (although I am not sure if this was related to the "javaw.exe"). Also added a FAQ section for troubleshooting.