Now I’ve found this issue occurs when these steps occur
Start developing a game or engine
Start an employee on their training
Go to Hardware or Research Lab
Go back to ‘Game dev’ Room
The person who was sent to train sometimes is stuck at 0% training and sits there doing nothing.
Quitting the game and reloading doesn’t fix it, the only thing is to Fire the offending employee and start from scratch. Kinda sucks when you’ve wet nursed the guy from level 2 to level 11.