Can't say as I'm happy with the issues I'm discovering in 5.0.9. Not sure if it is worth a support ticket, as likely nothing would happen until the next point-release, but so far:
- HTML Editor in AJAX client - cannot use Ctrl-B, Ctrl-I, or Ctrl-U for bold/italic/underline
5.0.9 - HTML editor keystrokes in adv. web client
- Alt-S no longer works for Send (Ctrl-S still does)
- Can no longer switch view from Conversation to Message and sort on the From column
That last one is a kicker. Alot of our users like to do that - not me, but regardless.
Bugzilla
Wiki
Source
5.0.9 seems to have broken a few things 
Linear Mode
