Using Omnirig and VarAC, all of the rev 7.x.x.x builds, the initial operating frequency is blank. If rig control is direct then VarAC successfully queries and identifies the frequency. But if Omnirig is selected, the frequency appears to not be queried and is displayed as blank. This really becomes an issue when trying to connect to another station that called CQ. When trying to connect VarAC believes the other station is on a different band.
The only workaround I found is to do a band change when first opening the app. For instance, just changing to 40 meters 7.105 and then moving back to 20 meters 14.105, the frequency is correct. And the whole time the VFO is accurate.