Well, this is an interesting pickle. Playing with the latest stable version, for reference.
I can't produce any Serum. I can research traits, design serums, research the design, and get the "insist on final test" / "finalize design" event, but when I go to the Production Division to actually produce said design, it's blacked out, and I can't select it.
Particularly interesting is that I've tested this on two systems; my main computer and my laptop. The laptop works fine, but the main computer has this error.
Looking a little deeper, and I see that on the Laptop (which works), it says "Max Serum Tier: 3", whereas on the main computer, it says "Max Serum Tier: 0".
That's probably got something to do with the problem, but how the heck did I mess that flag up?
If this helps, each time a new version comes out, I don't want to grind out my abilities over and over, so I use both the in-game cheat menu and the Console to manually set my MC's skills super high, and then grind certain things out quickly.
Problem is, I did this on both the laptop on the main computer, so if that cheating caused the problem, why didn't it cause the problem on both devices?
Possibly anything to do with the main computer having previous installations of the game? They're in separate folders, and I'm not stupid enough to simply install the new version on top of the old one, but the save files persist (IIRC, they're in the registry?), so maybe something else persisted and caused the error?
Any hints y'all could come up with for this would be appreciated.