So it seems there was a bit of an issue loading the main menu simulation when I started the game just now… the cycles all got backed up with different products, probably waiting for the new drugs to be named. Here’s a screenshot (warning: big image); note the two different ingredients on the multimixer’s belt, and the two different-coloured syringes. The cream belt is also backed up. I restarted the game, and it seems to consistently jam here.
It’s a minor note, and it doesn’t affect the actual gameplay, but a bug’s a bug.