Hey folks!
I never got the cookie error before, and I used this addon lot's of times already on many vB installations.
Today I catched the error on my dev'n'demo vB.
Since it ALWAYS worked fine before (even the same vB version on the same server) I imagined it had to do something with the vB settings.
OK, so much for the histroy lesson
I don't know the exact cause (yet) but this is what I just found out:
Turn *ON* GZIP compression in the vB options -> and it WORKS!
Turn GZIP off -> You (or at least me) get the cookie error.
If any of you who get that error could confirm this, we finally have at least a way to get it working and a base to find what's causing this