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To confirm I have understood your issue, when you plug the HDMI cable in HDMI 1 into HDMI 2 the picture and sound is fine, but when putting back into HDMI 1 you dont get any sound?
What is the source providing the input to HDMI (DVR, Satellite\Cable receiver, Games Console)?
I would be inclined to perform a factory reset, as some other settings may have also changed.
Normally analogue input is associated with using another source such as PC or composite input.
Ive seen instances where a software update does change settings, but it is unusual, when was the last time you switched to an analogue source on the TV (something other than HDMI)?
Depending on the version of software your TV is running its normally under the following Menu:
Menu > Setup > Factory Reset
Shipping condition would be the same as factory reset, not sure why they seem to use that for some version and factory reset for others.
At least after doing that and retuning that should mean you have defaulted all your settings.