I just got done re-building my whole Mugen roster of over 500 characters in without the DBZ characters this time around, and after all that my WinMugen crashed. I used the 500+ character slot patch from the site that also has Mugen Fighting Jam in it, but I'm sure it wasn't the issue, cause I added everything correctly from the screenpack into the winmugen data folder and font folder. I'm assuming that this is another character issue.
There should be a list of characters that are known to crash WinMugen so everybody can safely run Mugen without any crashes.