"Maybe enlighten me what you mean by (appended to the file "Old Fashion Way")" Oh. It is just that in the early days of office automation on PCs, people kept these habits to put the version in the name of the file from the paper world. Modern file systems and most applications now include more efficient version management. It is just it is not well known by users. Yes, alternatives are one of them. To give you an idea, most cloud based document applications can trace all edits made by every users and allow you to revert to any state (version) of the document.
Going back to your issue. What I suspected is the save path got corrupted. This is more common with external volumes. Restarting the computer can clear that.
WD