Run the resync hot key on razor. It repositions your character according to where the server thinks you are. I have been working on updating a newer uo client version for uor. The current client version is 5.0.8.3. The one I am working on updating is 7.0.15.1. The new one does not desync. Let me know if you want to beta test the client.
Your client gets desynchronized from the server. Example: You're running around and you run over someone that is hidden. Your client desyncs, your client thinks your coordinates are X=1105, Y=1515. The server which has the correct location says you're on tile X=1106, Y=1515. Now your client tells the server you're moving from location X=1105, Y=1515 to tile X=1104, Y=1515. The server sees that you're trying to move 2 tiles off 1 step and blocks the movement. Resynchronize client will ask the server for your current position, then re-position your clients position to match the servers position.
While running when I hit a keyboard button character stops and have to dbl. Click to run again.. just a fyi. Not a real problem... Good job staff... Uor is fun fun fun