in case you don't know, the .bak means that cobra is disabled. rebug does something similar when you turn off cobra. not sure why it happened randomly. I haven't encountered any bugs on 4.88, but I also haven't played my ps3 much. I don't usually play it anymore nor did I ever really. I was always more interested in the hacks and mods than the games.
anyway, I haven't encountered that particular bug. did you activate it with the activator built into cobra? or was this an official act.dat?
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btw,
@Evilnat closed the issue on github, since it's been fixed. I got that email on my phone, but not on the pc for some reason. weird. anyway, he'll probably see this thread later today. he was very committed yesterday.