Ok, the summary is not entirely correct. Here's what I did:

• Edit disc 2 of http://musicbrainz.org/release/86b13867-5c37-4cf6-b6f6-2aaebfc75448 to match titles from http://www.varesesarabande.com/servlet/the-35/Var%C3%A8se-Sarabande-cln--A-30th/Detail
• Associated all tracks with the existing recordings
• reached the edit note page
• Notices I needed to correct the capitalization of one letter
• back to tracklist tab
• changed capitalization
• hit "next"
• "Warning: There were one or more errors, please check the following fields: " with no fields listed