I was experiencing the similar type of bug on the 4.6.1 version. That bug was not fixed by me anyhow then I took the help of hp support assistant (viz https://hpsupports.co/hp-support-assistant/ ) and got the problem solved. You can also try them once if you want. maybe the error get solved.
-- <https://forum.pspad.com/read.php?4,69909,70663> PSPad freeware editor https://www.pspad.com
