QUOTE(Jax @ 05/27/05 12:01am)
Having a blast with the MOB Base Assault Maps!! The New maps are sweet! Got a question hoping someone can help me. I keep getting booted for a MD_5 Tool Mismatch. I have no idea what this is. It's happened to me all week. In Babaroosa and the new maps. If someone can help me with this I would greatly appreciate it. Thanks! Jax

The problem is you installed the 1.51b patch.
You needed to install 1.51 not 1.51b.
1.51b is only for SERVERS not for clients.
1.51b changed this file uo/uo_game_mp_x86.dll (and the checks are for 1.51)
You need to remove the patch (but you need to uninstall UO)
And reinstall UO and then instal the 1.51patch.