I have the newest versions from here:
http://ulyssesmod.net/downloads.phpUnder the "The latest stable release version of ULX and ULib:" downloads section.
The menu version on the ulx menu reads:
V13.8.30|ULX v3.61|ULib v2.51
Onto the issue, the ulx ban command works just fine however when any rank goes to use the "ulx banid" command it works as normal except for one thing. When you ban someone with "ulx banid" and set a determined time it will work correctly, on the other hand if you just ban them permanently with banid. It doesn't save and they are still able to rejoin just like normal. If you use banid and ban them perm. when they are still in the game it kicks them and says Dissconnected: Banned and what not but you can re join. If you need more information on this I can provide more.
Video: Explaining/Showing Problem
https://www.youtube.com/watch?v=ySMIiQtdtYcRegarding a question that may arise from watching the video, the issue only doesn't come from using the RCON tool it happens with all ranks that have access to the banid command.
Thread mentioned in video:
http://forums.ulyssesmod.net/index.php?topic=5247.0If you need more info just let me know, thanks