Happened with a custom map I auto-downloaded earlier on the same server.
The map on the server or in my mapfolder didn't change.

P.S. If you simply rejoin the server you get the "wrong map version detected" message again, and again, and again...

I know, got it also today, it was some ctf map. It doesnt happen alot so it isnt a big problem.

Happens to me too.

BIG BIG Problem...it happened to me after i made the map. I joined, i was in it for bout 2 seconds, than it kicked me saying wrong map version deteced, than it said i can't download the map from the server, i checked my map file and the map was gone, than i checked my recycling bin and it wasn't there either, Somebody plz help...spent a while on that map.

This seems to be a very popular bug. i have got it also

I had it some weeks ago...