Comment 4 for bug 53958

The border on the left of the scrolling thumb part lags behind the rest of the thumb when you move it. It will catch up eventually, it just takes a bit to realize that the thumb has moved. Very odd. Obviously a minor thing, but noticable and annoying. ;)

Here's the bug report on their tracker, looks like it's assigned to you too so you probably already know about it. The guy reports that he's using an 0.6 package, but maybe the FC3 guys backported part of 0.7, because I don't experience the problem with Kubuntu's 0.6 version.

https://bugs.freedesktop.org/show_bug.cgi?id=5811