I have never been able to reproduce this issue and so far the only fixes I have applied do not seem to have helped, so I am not sure what else to look for. If we could find a way of reproducing the issue, I would be able to track down the cause. Since no one else has reported this issue, it may be that it is related to something specific to your system, such as your graphics card driver. Which processor and graphics card are you using? Are you using the latest drivers?
