6d floads the log with ScriptWarnings until the server crashes, constantly.
I just recently tested both versions and it seems that the 5f runs a bit better except that its buggy. One of the major bugs are the right hand weapons being split in half or not showing at all which causes a lot of confusion when aiming and shooting.
I did a little research about the mods and found out that those 2 versions were stolen from a site's ftp which were still in a beta/test state. It looks like that same fellow came and released them here without permission...
I will also like to know what're the real differences between GlobalUnreal, UTProMod, and Newnet. From looking at their script I see that they have small differences done by separate communities. Some versions brake things by trying to fix a small bug, and others are just plain broken. I wonder if there's an actual final version of any of them where everything works properly.
Also, I found a 7x version in my cache and I was wondering if there's a public release of it with all the server-side files included and a readme on how to run it.