I tried the following:

1. Download pspad462en.zip and unpack it into a fresh folder.
2. Download pspad500b261.zip and unpack it into the same folder.
3. Configure TC to use PSPad from that folder.

With that configuration, the problem does NOT occur.

So I guess the problem is related to some setting in my original PSPad

PSPad freeware editor https://www.pspad.com

Odpovedet emailem