I might have done something wrong here but when I was using selector drive mode on the TGV on scenario planner the blue cap bar didn’t appear on my HUD but on the train indicator only
Make sure you release the throttle (apply no power) when switching control modes, switch, them ramp up power again....
Hope it works, I saw your other post around VACMA and TVM, with mine downloading now, I'm praying it's not broken :/
I can confirm I have not mentioned VACMA or TVM I can also confirm the train works I put it straight into scenario planner on GWE and didn’t notice anything obvious