No, I'm using Fedora 11 x64.
It only happens on contacts with a few pictures stored in cache, like one or two.
Contacts with at least one row of pictures won't show this problem.
Here's an example:

The frame will keep refreshing very fast like it wants to place scrollbars but can't since there is nothing to scroll.
You'll also see the scrollbars flickering (appearing and disappearing very fast).
It will stop when you wait for a while or resize the window.
Thanks for showing the N900-version, it will definitely be my next phone:)