I installed cncnet a couple of days ago and have the same problem. My mate has this problem as well.
Played for like 10 hours already.
I did notice some random number misplacements on some maps, like in the attached ss.
Edit:
From this tread: http://cnc-comm.com/community/index.php?topic=4556.0 I saw it should download .png's, but it doesn't.