Using Mac Leopard (10.5.5) on dual-core Intel.
I installed the upgrade from desktop 0.91 to 0.92 (1418) yesterday (12/9/08) and immediately was unable to send or receive messages. The outgoing messages stacked up in the outgoing folder and the incoming never showed up (I know I should be receiving them). I rebooted a couple of times (same result) then went to the online site and saw all my incoming messages (lots), but no indication of outgoing.
Today I dumped 0.92 and reinstalled 0.91 and all's well. But I keep getting messages to do the upgrade. A message indicated it would automatically upgrade when I start the program again. I don't want it if it doesn't work.