Did anyone had a situation after entering the portal that it didn't teleport you, but you were in some different space with purple color and you had to move forward to be teleported? I had this once on the DM2 map. I tried to repeat this, but I never succeeded.
That should be a known bug on a specific teleport that exists on the DM2 map. Not sure if it's also present on "regular" Quake but it's been on QuakeWorld for as long as I can remember.
On the backroom (where there is Red Armor and Mega Health) there is a teleport that goes to the main (BIG) room of the map.
If you jump just before the teleport and "aim" your jump so you go in the top left corner of the teleport, you'll get stuck inside the teleport but not go through until you move a bit.
Also, staying stuck for too long on that teleport during a game, will drown your player, which should definitely confuse your opponent as there is no water deep enough to drown players on DM2.
Yeah it's probably qw only. It's pretty easy to get it running these days with the recent clients. You can just download a qw client (ezquake recommended [0]) and extract the executable to your quake folder.
Alternatively you can download nQuake [1], a full pack with most things included except for the non-shareware maps. You can then just place the pak1.pak file inside the id1 folder and make it complete.
