The problem seems to be that on several tracks the automaticly recorded replay in ManiaPlanet\Replays\Autosaves aren't recognized correctly.
I got this problem in A02, A14, D15 and E01.
After starting ManiaPlanet, my ghost isn't displayed despite of the fact that there's a replay in the autosave folder. (And yes, I turned my ghost on

)
At the checkpoints split times are displayed in white color and do not show the difference to my best time (in red or blue color).
After reaching the finish of the track, a new ghost is created.
This new autosave file overwrites the old file even when the new file is slower.
This new autosave file is recognized as long as I don't restart ManiaPlanet.
After restarting ManiaPlanet the autosaves of A02, A14, D15 and E01 aren't regognized again.
Astonishingly I only have this problem on A02, A14, D15 and E01.