I am not pissing in the wind, there is something wrong with your setup, absolutely and I trying to help you clean it up. Empty all 4 tuners and start a scan for adapter0 only. I would even remove the 4 adapter dvb-c conf files in /var/opt/nextpvr before attempting the scan. If adapter 0 then doesn't have channels there is a bug that sub needs to look at. It could be small perhaps a channel name I didn't see that had a Finnish character or something like that.
The only reason to scan adapter 3 would be if you don't ever want to merge channels and never accept the option to copy from another device.
I emptied all sodding tuners and started again. Dont get me wrong, your baby is actually quite impressive, but he or her just puked all over me after the update
Sub is the author I am just trying to help, but NextPVR is impressive and I think you can get it going again. I am hoping the fresh start in logical scan order logic that sub is hoping for will make a difference. I had lots of trouble with digital scanning until sub explained the scan order.
After the scan don't do the EPG update and try to play a channel and then upload the logs if you still have no channels.
I'd do what Martin suggested. He is trying to resolve an issue we were aware of, that could have originally started in the older releases, and fixed in the current release.
Go to the Settings->Devices page. Hold the Ctrl key, and delete devices 0, 1, 2 and 3. Click the 'rescan for devices' this should get you back to 4 empty devices. Scan device 0 to get the channels you want. Click on device 1, and accept it's option to copy the channel configuration. Click on device 2, and accept it's option to copy the channel configuration. Click on device 3, and accept it's option to copy the channel configuration.
At this stage you should have four devices, all with the same channels (and linux conf files), and they should all work.