Comment 2 for bug 558648

I've seen this as well (I really thought you had an existing bug already for this but can't seem to locate it at the moment). Would be nice to have a reliable way to reproduce it, but I've had the same experience in seeing that it is very rare, and doesn't seem to relate to anything that I can tell that I'm doing to trigger it. Setting this to low since it doesn't seem to have much more than aesthetic impact at the moment.