You have some strange third party content installed.. The correct data for loading the CSQC part would be:
CSQC dlcache/csprogs.dat.403140.50721 loaded (crc=50721, size=403140)
Please remove all extra pk3 files you might have from your data folder.. (including ~/.nexuiz/data !!!)
~/.nexuiz is a hidden folder in your 'home directory'
I think by default you need to enter this extactly like that into the 'goto location' dialog. Search the forum, there are several posts that explain this more exactly for mac people.. i do not own/use macs so i'm too lazy to check it out
Or rather den deleting those extra pk3 files move them to a save place so you still have them
