"currently investigating" numerous reports of it crashing when EU and US players meet, you should stay apart.
The studio is yet to identify the problem so don't go crossing that Atlantic Ocean. They're doing "everything in our power" to tackle the game crashing bug. It released in Europe yesterday.
The US version of the PSN title launched April 10th. Obviously this nasty little surprise was just that; a nasty little surprise. Just stick to your own backyard for now.
"We have received a handful of reports that the PSN version of Skullgirls crashes when a player using the European version tries to play against someone using the North American version," said Reverge Labs. "We are currently investigating the issue, and will begin work on a fix as soon as the problem is identified."
"In the meantime, the best way for PS3 users to minimize the potential for crashes when playing online is to limit your online play to players in the region from which you purchased the game."
"Know that everyone at Reverge Labs and Autumn Games will do everything in our power to address this problem as quickly as possible. We apologize for the inconvenience, and appreciate your patience."