Not sure who else had this problem, but when the newer beerbowl map was added to the server, I had to delete my local copy of beerbowl.bsp because the filename was conflicting (perhaps pl_beerbowl_rc1.bsp, but not 100% sure). Once I did that, the next time I joined that map, it downloaded the version that is currently on the server and I could play.
tldr; At least for me, the root problem was that the old version of the map was the same filename as the new version. Might be a different issue for others though.