I just received a new Forerunner 945 and right after powering it on i experienced a problem
with the display.
Everytime some menu item is displayed with a partially or fully bright (white) background the backlight / display
gets dark and nothing can be read properly.
If the background should be completely bright with only black text in front you can't make out anything on the screen.
If it is only partial it looks very dark, like the backlight is only set to 5%.
I upgraded to the newest Firmware and also tried a Reset. Nothing helped so far.