I updated the game to 1.5 when it was newly available, but didn't play it till tonight. I went to check the new benchmark option and all was fine till I wanted to change resolution. My monitor is 1440p and wanted to taste the performance at that instead of the 1080p resolution that I last set it at.
Unfortunately the game doesn't any more allow me to change to higher resolution than 1080p and I am like, WTF?
Is this a bug or what?

yes I know there is now a 1.6 version, but since we are talking about many GBs, I rather know for sure this is a temp problem than more before i download the game again. (Offline installers which btw GOG never notified me as it does with other games that there is an update for them so I just found that there are indeed 1.6 version available. Anyway that's not the main issue, but the resolution.