on my server
Wait... wut?
Is this a full time server I'm not aware of?
Or just a local machine testing our projects server?
Also, Krooks, welcome to addon pain.
Most times when jail has broken due to an actual 'Gmod' update around here, it wasn't ULX, but some other addon (Ulysses once, but usually not).
Do the typical run with Ulysses mods only. If still broke, remove all but ULib/ULX only.
Look for startup errors in server console that weren't there before on startup and when jail/kick/whatever are run.
Let us know what you find... we're used to having to change stuff due to updates.
There was a 'commands break over time' problem that I never see get resolved, but seemed to fix itself, but I've not seen that in a looooong time.