..in my experience:
all java chats are "iffy" with any mac browser.. I've encountered too many problems to list in the past, but have found a lot of satisfaction in Flash chats and/or
PHP chats..
..I know Chestnut (dev.pnconcept.com) is working on a nice simple flash chat solution.. demo might still be online there.. I've got one I paid $5 for and it's packed with features.. search the forums for "Flash chat" ..that should turn up some decent results.. if interested.
good luck!
-IR
--
http://www.invalidresponse.com [25]