I've upgraded from 6.0.7 to 6.0.8 NE today. Also applied the 6.0.8 patch.
After upgrading, the preview pane no longer displays the "From:" header field correctly for all messages - for a local user it simply displays the first letter (!) of his/her username.
Even though the header field says "From: John Doe <firstname.lastname@example.org>", Zimbra simply displays this as "From: j" in the preview pane. This also happens for some, but not all, remote senders.
Anyone else seen the same? I'm using Norwegian translations, but see the same problem if switching to US-English.