DXZero, natedog, darkmasterx: I've seen this problem before.. And it's most common in high lag situations. I believe the problem is sync connection (probably because you wern't hosting). Try to attack while you're in the air next time this is happening, instead of blocking. If nothing goes through, it's probably just a sync being lost whey they use a super... Also, one more thing, after this happens, does the screen ever freeze up (both characters) and the "sync lost" screen appear (even breifly)?
SSJKarma: I think I posted about that "blocking against the AI" bug a while back... It only seemed to happen on Sent difficulty levels 0-1 (0-1 on a "how many times" you beat him scale). After that, it seems like blocking is fine.
BTW, it happens no matter which character you use and I believe it can happen before you tag out (like after the Sentinel uses his first super or something).
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