The word "error" is seen about 14 times with nothing really unexpected except for the Hauppauge tuner. Try this:
Start a telnet session and enter init 4
Make a complete copy of the enigma2 folder in the receiver's /etc folder (/etc/enigma2)
Now delete everything in the receiver's enigma2 folder Except for the settings file. The settings file should be the only thing left in /etc/enigma2.
In the telnet session, type reboot to properly restart the receiver.
Blindscan 101w C band after the reboot and then test the various channels. Blindscan a few more satellites if everything is OK and verify they work.
As for the image updates you mentioned, I do not think anything was in them that would cause this problem. The ATSC dvb satellite inserts could I guess cause dvb-satellite problems. But I would expect the ATSC updates to cause problems on both polarities and not just horizontal. And add that no one else has reported horizontal polarity issues like you have described.