Thanks for posting.
I notice that your zoom level is set to 150. Is this reproducible when the zoom level is set to 100?
Does this occur when scrolling up or down?
It looks like you may be running into a known issue but I'd like to confirm because previous reports indicated that this only occurred when scrolling slowly.
It is produceable at the 100% level. That is were most of my users operate.
It usually occurs when scrolling down becasue that is the way we always go first. Have not really tried to reproduce it scrolling up.
This more often occurs when we scroll quickly. Older machines seem to be more likely than newer ones - seems to be related to processor speed but not closely related. We have had this problem since we moved to OSX 10.6 and FM 11. We had hoped it would be corrected by now so did not bring it up and have not seen any other similar posts.