I wish they would stop doing things like this!
Well, lets all thank Microsoft again for screwing up Windowblinds. The Windows 10 update to version 1809 has messed up the explorer background color in the treeview area on the left. It is being forced to white, and the only way to fixed it is to set the Windows color in SkinStudio or WB itself in the Modify Style, Change System Colors area to match the rest of the explorer area. But doing so screws up many applications that need to have a white background in order to remain functional. Microsoft Office, NotePad and many other dialogs and applications that use a white background get ruined.
I sure hope this can be fixed somehow, as it has totally screwed up every single WB skin that uses an explorer color other than white.