Running NPVR 4.0.4 with HDHomeRun (very latest firmware).

Using NextPVR application (on windows 10), OR on any version of Kodi, I can not use the program guide to switch to ANY standard def channels. No issues at all with HD channels or going directly to the channel from the channel selection. This is specific to selecting a show from the guide and pressing the SWITCH button.

Any help is appreciated.