Winver reports Version 1903 (OS Build 18362.418). Paint Shop Pro is Version 7.04. WindowBlinds is 10.84 (059 - Windows 10 Edition) - 64 bit OS.
There are many problems with PSP and WindowBlinds. For all of this I uninstalled WB, wiping it completely, reinstalled it, set up to use Precision XP skin, and then did the following. If I load PSP I get a nice window.
If I then resize it, the window is redrawn very badly, with only partial title bar contents.
If I reload PSP, minimize it, and restore it, the window is drawn with no titlebar information at all -- just black, not even a graphic.
If I reload PSP and move the mouse over the minimize-maximize-close buttons, there are not hot-icon actions (glow and so on). If I press down on the right-hand part of the close button but move the mouse off screen before releasing it, a small X appears where WB apparently things the close button really is (not where it is drawn). If I do this two more times, once on the middle of the close button and once on the left of the close button, I get two more icons, miniature maximize and minimize respectively, which also are where WB thinks the buttons are but not where Precision has drawn them. If I click any of these miniature buttons (all inside the Precision close image) then the appropriate corresponding action occurs.
Hope the pictures help.