I have a strange issue when in 3D view where the previous plan window flashes up briefly every time I orbit using the Shift+Middle button. It specifically flashes when I let go of the keyboard or mouse buttons.
However if I am in orbit mode there is no issue at all, as soon as I exit orbit mode by clicking ESC it flashes again.
I am using Archicad 25 and it is occurring in both 5005 and 6000 across multiple files but not for anyone else in the files. All graphics card drivers are up to date.
