I am using the latest version of Windowblinds.
On certain popup windows (even in Windowblinds) , information and/or buttons are invisible until I hover the mouse over them.
Here is an image with hidden buttons (Cancel, Add to custom colors).
.
When I hover my mouse over the invisible buttons (next to OK), they appear.
Here is image of the visible buttons . (Cancel, Add to custom colors).

Here is WindowBlinds version

Here is Windows version

Thank you for your assistance.
PS. The problem disappears when I unload WindowBlinds.