I just noticed this in practice last night. Pulled in pits, the pit menu flickered real quick, nothing happened and I noticed the app wasn't present on my screen. Checked the apps bar on the right, not there... checked the main menu and it's checked in the enable apps section.
Reset twice, no luck... I've been using an older version that always worked across many updates... now it's vanished... but it's still in the background someplace as it flickers the menu, so it doesn't allow me to just do it manually either...
I've not tested qualifying or race yet or reinstalled but I was curious if anyone figured this out yet.
I'm with same issue in race session.