A reproducible bug on the Windows version was reported; something about "javaw.exe"
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.