If you close PSPad and later start it again, the last document on the screen has disappeared but its tab is still visible. It only happens when the last document was focused when PSPad was shut down. By first clicking another tab and then the last one, you will see the document again.
-- Met vriendelijke groet / kind regards, Ruud Baltissen www.baltissen.org <https://forum.pspad.com/read.php?4,79312,79312> PSPad freeware editor https://www.pspad.com