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I saw the paint bubbling but it happens on aluminium frames from the white surface corrosion, not necessarily an issue so I wasn't overly concerned. I bought the frame a couple of months ago on retro bike and didn't notice the crack at the time so have no way of knowing if it was even there then. Oh well, I'll know to check next time.. I have another 90s cannondale at work I need to check asap tomorrow, it's got me worried!
That's quite a lot of paint bubbling too, had you missed that when you were building it or did you think that would be alright? That would have worried me even without the crack.