

Not the person you asked, but one game I had problems with on Steam that I did not on GOG was the OG Riven. It was still playable, but the various animations associated with pressing buttons and suchlike were completely broken. Very rare experience though and I have played many retro games on Steam.
I have an infrequently recurring dream where I’m running late for work and I call in to say I’ll be late, and then I blink and hours have passed and I’m freaking out because apparently I was in a fugue state and I call in to work again to try and update them and the whole cycle repeats until I finally wake up.