Need to know what other software you're running on the background. Winstep? If it is, try disable that reboot and see if it help. Report back here.
Sorry about that, Please ignore that, After loading some other Windowblinds skin, I can reproduce your issue. It look like Windowblinds Animated start buttons vs Start11. I have forward your problem/question to Stardock Support Team for their assistance. Please keep an eye on this thread for any updates. We appreciate your feedback and patience.
Thanks
Basj,
Stardock Community Assistant