Why does updating my MTGO always comes up with protocol errors?

technical-issues magic-the-gathering-online

Solution 1:

There is a FAQ for the most common MTG-Online errors here: http://community.wizards.com/go/thread/view/75846/27085537/MTGO_Technical_Issues_FAQ!_*Start_Here

For your protocol error, as Krazer stated, the recommended fix (See also section 1-7 in the link above) is listed as such:

Delete the NewFilelist.txt file located in the MtGO directory, then start.

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