I had a phantom report of a change on my personal blog [Q's Wire] using a Mac Firefox browser put could not confirm anyplace else. Q....
You are wrong there. Google updates PR all the time. But it only updates the visual PR every blue moon. For example this post might be PR10 at the moment but you won't know it until the next update.
You've probably been penalized. Read more how to identify if that is the case here: google bitch-slapping penalty
No changes too! Just don't expect update soon. . . When it come you'll not get upset whatever happen.
When I was a newbie noob at DP I too used to get all excited at DP at the slightest hint of a PR update and start a thread like this. I am wiser now
No changes to the PR bar in the browsers, but heck, that is only a marketing gimmick! MY sites are climbing, so I assume my PR is too (behind the scenes)