Sorry about that. We were hoping the Character Palette Bundle DLC would fix things, but that doesn't seem to be the case for some. We're submitting a patch that includes a fix which we think will address the problem, and that should be available in the next couple of weeks.
You may have tried all of the suggested fixes already, but in case you haven't, please see these posts we made on our Facebook page in reference to the issue:
https://www.facebook.com/skullgirls/posts/675037349230429
https://www.facebook.com/skullgirls/posts/676035912463906
Hopefully one of the methods mentioned in either of those posts will fix the problem for you.
If anyone else here in the forum is able to point to a thread with a solution that has worked for them, please do!