I am aware of a Bug, with naming UDD Scans like "ABC-AUC 192.16.190 - 255.255.255.0".
They will save the first time, but after closing and reopening, they are not visible inside the config.
But you can see them, inside the native database under Table "LD_TASK_CONFIG".
If you then make the Task again with the same name, Landesk will crash with a exception everytime on clicking UDD Scans.
So maybe check your visible configs against the ones inside the Database.
Hope this helps.
What Database are you using ?
Troga: These are configs imported from our previous 8.8 server, I didn't actually change any of the settings.
Frank: SQL 2005 on a remote server
This seems to have been resolved by patch UDD-4255590, courtesy of LANDesk support.