It turns out that this is an issue due to running out of space on my remote server. Once I cleared out some backups I didn't need and other useless large files or directories, everything went back to normal.
It'd be a great feature to have the PsPad message tell me that there wasn't enough space to save the file! :) -- <https://forum.pspad.com/read.php?2,69529,69536> PSPad freeware editor https://www.pspad.com
