Hi,
I've noticed that with the latest versions, GG (mar.15b) and Steam (2493), .. of SABOW .. that Tank speed can't be controlled using the Movement icon.
You can only use w and s to control the speed of the Tank ..
The Tank or Platoon turning icon still works fine.
Original version (1962) and early re-mastered version (2398), ... both work fine.
Cheers
Tom