I usually save newer versions of my PCB layouts with the actual date in the name within one project\, i\.e\. yesterday it was "PCB\_2018\-04\-01" and today I would save a newer version as "PCB\_2018\-04\-02"\.
I can't do this anymore in v5.3.14 - when I click "SAVE AS", I'm getting a box asking for a name. I change the name and click SAVE. The file is saved but the older file is overwritten and the name does not change.
Only workaround at the moment is to clone the file and give it a new name before editing...