It doesn't seem to matter if there's a "timer instrument" or not on the layout regarding this Ack popup disappearing.
- Once the timer expires, the Ack popup shows up then goes away within a second.
- Pressing the flashing "i" button at the bottom left brings the Ack popup into view again for just a second.
- If the timer instrument is on the screen, it's flashing red and you can press on it and do something about resetting the timer, but otherwise you need to go thru Setup | Timers to reset the timer. I'm not sure if the Ack popup will take you to the timer or not -- even if I'm really fast as pressing the yellow Acknowledge button in that popup, nothing seems to happen. If it does, that would be a good thing, because unless you have the timer in your screen layout, it would be a pain in the butt to reset it.
Note that I'm testing this at my desk with "Paused when on Ground" turned off, using just one timer (Switch Tanks).
Thanks for putting this in.