Maybe just try pressing F12 *without* the Ctrl key? I have no issues getting screenshots this way.

Nope, no screenshot. I've even run Steam as administrator, no luck. It's like I'm not allowed.

Hmm, I've checked and it seems that you are right. Where before I often made screenshots by accidentally touching F12, now I can't do anything even if I try really hard! And indeed, CTRL-F12 won't do it, either. I'm truly confused.

I saw about changing some settings using shift+G, so I tried some things in there. Still no luck. I have no idea what to do now.

I've found that in other games, it won't work anymore, either. I think it might be a bug caused by an update in the Steam engine itself.

Well, that sucks. I guess I'll use Windows snipping tool then. Blech.

Well, I made a mistake and found a way to make screenshots. Instead of hitting Windows+shift+S. I did alt+shift+s, and I got a screenshot, It was save to the "Her New Memory" root folder, but I did get one. Great!

That's a good solution. I've never liked whatever solutions M$ came up with for most situations, and the same goes for its screen grabbing tech. So I installed an external program (bandicam) quite a while ago, that works with any program --Steam or not--, is triggered by the PrtScr key (or actually whatever key *I* choose to link it with), and does all that *I* want it to do, but not what *others* tell me it should do.