This one's got me sratching my head.
I'm experiencing exactly the same issue described here:
http://pana3ccduser.com/showthread.php?t=16065
Tried resetting the camera and using a dry cleaning cassette and the same issue exists.
Here's what the viewfinder shows:

I've joined the above forum, so that i can send a PM to the person making the same query and see what was required to resolve the issue.
In the meantime, any ideas or things to try?
Cheers
Steve