I can see why you've got no listings, but its hard to understand how you got it that way. It looks like you'd temporarily tried the DVB EPG option, which is not valid in the US, which led to the creation of channels which cant get their listings from anywhere. You had listings in your database, but they werent mapped to any of channels that were enabled.
Try the following (exactly): Delete your c:\program files\devnz\gbpvr\gbpvr.db3 file. Run the config app and recreate your capture source, selecting the device type etc, then configure your EPG source to use the 'Schedules Direct' EPG plugin, then hit 'Update EPG' button. When this completes you should see the list of channels '2 WCLF' etc. Hit the 'Map digital channels to epg channels' button. On the left it should have the list of channels that were pulled in from Schedules Direct. It should now scan for channels. At completion, click the tuning request colum next to each channel on the left that you want to map, then select the digital channel from the drop down list. Do this for each channel you have available. Then you should be good to go.