As you are aware, Update 9.17.1 will come out tomorrow, but I’ve just got warned about a bug.
If you have the Type 5 Heavy on Accelerated Crew Training TURN IT OFF before the update. Bug doesn’t allow you to turn it off.
There will be a micro patch at a later date to fix this issue. Thanks to World of Tanks Twitter for the warning and don’t forget to share this with your friends.