Probably not easy/worth the time to fix, might not even be fixable from your end, but I figure it might be best to report this just in case. SpecialK seems to crash when Action! tries to hook in for its overlay. This appears to apply to all games, but sometimes Action! just gives up on capturing the game (or doesn’t detect it as capturable?) instead of being able to crash it.
Here’s the crash logs: https://terribleideas.org/spk-ffx-logs.zip