Can’t login after upgrade your wordpress ?

Not for me, so far after upgrade to wordpress 2.6 , everything is smooth here. But i did saw some people mention on twitter or blog about can’t login problem after upgrade and i saw a solution today.

Base on the solution it seem like basically is because of mislocation of cookie issue ? i wonder why is it not affecting everyone but some of the people ? anyway wordpress is rocks but at the same time it seem like getting huge and toward CMS direction ?

This make me think of visit habari.