EDIT: I must have been tired this morning, I just read your post again. Are you saying your trying use Xlobby's IR functionality with the USBUIRT plugin? Can the USBUIRT learn the codes from the Pronto?
I can't really help with this (I don't use Xlobby's IR functions) but wanted to make sure of what your problem was.
good luck,
tsw
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Your best bet is probably going to be to search AVSForum or RemoteCentral for the discrete codes for you TV. You can then format those for the Pronto and program.
Here's the AVSForum owners thread:
http://www.avsforum.com/avs-vb/showthread.php?t=627274
Here's a thread discussing an issue with the TV's firmware related to a MX-850:
http://archive2.avsforum.com/avs-vb/sho ... t&t=680352
good luck,
tsw