Try reloading the skin if that doesn't help, please remember you are using a Beta build version of WB. The latest release version is 4.20.017, you may have to rollback to that version until they get all the bugs worked out
I uninstalled the beta versions of DesktopX2 and WindowBlinds, and went back to the previous (and non-beta) versions and now everything is peachy. Definately an issue with the beta's.