hmm... do we know if this was ever resolved? I have a client who's cookies keep getting dropped after only a few minutes on the forum. IE-only, mozilla seems to be ok.
I went to mycookies and had
PHPSESSID
custom_w3t_myid
custom_w3t_mysess
custom_ubbt_admin
then I went into the forum and got logged out pretty soon. When I back-tracked to the mycookies file all I had was:
PHPSESSID
custom_w3t_mysess
custom_ubbt_admin
???