I just wanted to tell in here:
I just got confirmation of quickness, that the fix that I fortunately committed to CB 1.2 RC 3, was working.
So CB 1.2 RC 3 fixes that particular problem, by working around it with a cleverer cookies handling.
However, Joomla and Mambo don't have such a handling yet and with multiple versions of site url you may encounter same problems in other areas.