Just to second that, yes VB moved over the ORION System and if you have not been listening for a month or so, you probably are not going to hear anything on the old system. The good news is that your 197 is capable of monitroing ORION!How are you programming the radio. I am using Win500 and it programs my Pro-197 correctly.
You do know they went to Orion check here Overlay Regional InterOperability Network (ORION) Trunking System, Virginia Beach, Virginia - Scanner Frequencies
I can send you my Win500 file if you are using the program.