Hi! I just want to mention that I have this same problem (am also on Windows 7), and there isn't a ldtk.log file in the directory that you specified. I'm assuming ldtk.log is a crash log file, which would explain why it isn't there, because the program doesn't crash, it just shows an empty screen with no warnings or errors.
Thanks, I’ll try to fix that for 0.9.4 :) There is an open issue here if you want to get notified of any progress done: https://github.com/deepnight/ldtk/issues/498