Again, if you think this is a new problem, please file an issue in our github page (if not done already). And describe it as a new issue - besides the already known one. So we know you don’t talk about old stuff.
We changed some things with the internal update interval of the MCDU recently - to make things more FPS friendly. There are some (known) problems with that (e.g. distance counter), maybe it also effects the approach procedures.
EDIT: btw, the distance counter should work again with the latest dev.