It doesnt work. I (the superadmin) spawn a prop. i own it. a player spawns a prop. "Up For Grabs!" owns it. I can not touch it. he can not touch it. I do ot have umotd installed. tell me if you need more info. if so, of what knind. no errors in console.
Have you fully restarted the server? (Not just a map change) ANYTIME you update a server mod, you must restart the server fully to rebuild the server lua cache.
If you use sv_downloadurl, make sure to upload the cache folder to it.
If above doesn't help.
What version of Umotd do you have?
If 2.4A, try removing it, then restarting server. (!serverinfo or Umotd serverinfo from command line will have version in first few lines)
If not 2.4A, get 2.4A (SVN revision 6 I think) and restart server.
If removing Umotd fixes the problem, let us know.
(TRY RESTARTING SERVER FIRST BEFORE REMOVING ANYTHING)