Soon after I entered Austria the map went onto what appeared to be night mode. Almost impossible to read in daylight.
Fiddling with the display brightness settings made no difference. I thought it might be the mechanism that dims the display in tunnels, but this continued to function - the display went even darker in tunnels!
And then about 20 km from Hungary the problem became clear. The 'Join between Hungary maps and Austria maps was clearly shown scrolling across the display as I travelled. Just like dawn,or an eclipse, daylight in Hungary,night time in Austria (It was about midday )
I can only assume the Austria maps had a bug that set them at night mode during the day. I dont know if there is a way to override this, or would Austrian users have virtually useless maps until the next update?