Annoying problem about app custom settings being discarded at app shutdown

Hello, this is my first post in this forum. As stated in the topic title, the last three update (as far as i can remeber, at least!) came with a potentially nasty behaviour. Anytime i shutdown the app, whatever custom setting i've inputted in that session goes dumped. Neither administrator run nor app (or even OS!) reinstall on either system and non-system folders solved the problem. I'm currently using v7.39.2x64 with just ffdshow_rev4531_20140628_x64 codecs installed (video related) on a Win10 1909 x64 machine (which worked more or less flawless in previous releases). Please, help me.