That happens when UT can't determine a bandplan. It should be able to determine one by default on a typical Type II Moto system. But sometimes that isn't possible.
Sometimes simply doing something like starting the Receiver in UT, letting it run for a minute while sitting on the CC, stopping the Receiver in UT, exiting UT, and then re-opening UT and starting the Receiver will allow it to continue on correctly.
If it's rebanded, that could be a problem - or if the system has an odd bandplan, that coudl be a problem. In those cases you'd end up having to add a custom bandplan.
You may be able to "kickstart" it by calculating the frequency based upon the channel number, entering the frequency in for those channel numbers, saving it, exiting, and then firing it back up. It may take 2-3 freqs filled in manually for it to work.
You should download Trunk88 and run it as well (just to see if it pulls up the freqs without problem). I'm not promoting Trunk88 over UT or vice versa, but two heads (or two trunking apps) is better than one.
You will have to enter in at least the first freq (of the control channel). I used UT for a long time but have been using Trunk88 as of late. I just opened a pristine UT install and encounter the same problem you do on every system... never used to happen. Even on non-rebanded systems its having a lot of trouble figuring out the bandplan. I think I'm missing a step, becuase UT never used to do this on a simple Moto type II system.
Mike