I have updated mine to the latest red dot firmware and have come across abit of an issue. I have mine set to show 5 parameters on the first screen. I have found that parameter 1 can't be changed and only shows MPH which is to be expected as this is how earlier firmware was. Parameter 2 cannot be changed, doesn't show. Parameter 3 is in top left position (should be parameter 2). Parameter 4 is in top right position (should be parameter 3). Parameter 5 is in bottom left position (should be parameter 4. Bottom right position cannot be changed (should be parameter 5).
This only happens when viewing 5 parameters per page. Bacillus, I know you are registered on the Polar forum. Might be worth forwarding them this info to make them aware of the bug.
Here is a photo of my screen looks.