Just upgraded from M4 to M5. Everything was working fine in M4 so I'm pretty sure it's not a hardware problem.

I just can't get Myth to change channels. I can open a terminal and use directv.pl to change channels no problem, but myth errors out. I've tried chmod 777 on directv.pl, /dev/ttyUSB0, /dev/video and I've tried chown mythtv:mythtv on the same. still no go.
I've deleted and reinstalled the video source twice, reloaded the channels twice. I've even deleted the capture card, source, etc and reinstalled. still no joy.
tv_grab_na_dtv seems to be working fine and mythdatabasefill --manual grabs the right channels and sets up the database. The channels show up in the channel editor.

The channels all show up in the OSD but it won't go to the new channel when I select it.

When I try to change channels it acts like it's changing, the display freezes and then resumes, but it doesn't.

Checked the logs and the backend error is:
Channel(/dev/video) Error: GetCurrentChannelNum(244): Failed to find Channel
etc

Possibly a clue: I have Input Connections set to default to channel 244. I also have the OSD set to start at channel 244. However when I open the OSD it's always on channel 4 (first channel) and if I use the remote to go up a channel it always starts by trying to change to channel 6 (second channel).

Again directv.pl changes channels when run manually
i.e. from the terminal /usr/share/mythdora/directv.pl 242 will change the channel to 242

Help!! I've been banging my head against the wall for three days now and I getting nowhere.

FWIW

System is a Asus M2NPV-VM mobo in an Antec Fusion case with VFD, Hauppauge 350 and remote. I'm using the component video output. Using USB x USB to control the directv STB, again this was working with M4
I followed the tips on here about removing the Nividia drivers and installing Kmod-nivida so that's working. I also did the changes to get imon and lirc_i2c working so the remote works.