Solved

Annoying

Wee progress bar for second driver in nearly invisible starting to think I going blind.

Though it isn't a bug, but a visual eyesore nonetheless...I'll move it over to the bugs forum.

Including my own shot of the case on PC:

I general I find the new grey background with words/numbers in a different shade of grey to be not very good for visibility. It can be hard to make out stuff without squinting, and in general I think the interface looks duller with the shade of grey used. Perhaps have the white/lighter background back, or use another combination of colors so the words & numbers stand out a bit better, without overcooking it of course. Just my thoughts.

This all happened as soon as the background became slightly transparent...
Just make the white bar a different colour so it has no chance of being the same colour as the background.

the green one would suit the other green buttons on the training page...

Does anybody still feel like this is an issue?

I never noticed this, but it does seem to be fixed, so I guess no more issue?