they were both fine one minute then not the next
This suggests to me that something changed on your PC. Are your video card drivers up tp date? Have you downloaded any new programs right before this issue started?
Do you have the most recent edition of Windowblinds and if so, did this start after your most recent update?
It might be a good idea to post your WB info, so someone who know how to read it can see if anything is off on it. Click the 'about' tab in Windowblinds, then click the 'copy to clipboard' button and paste it in here.