After editing the "Release Information" page of http://musicbrainz.org/release/b05b8ba3-6c8c-40a6-9240-f93c4df8a206 , I attempted to move to the "Edit Note" page, though was returned to the "Tracklist" page with the error:

"Error: Track 1 has an invalid length. Must be in the format MM:SS, Track 2 has an invalid length. Must be in the format MM:SS"

The tracklist:
"1. A Noise Piece Done by Someone/Mary Get Your Knife - pg
2. The Longer Now - pg
3. Secret of the Woods - Reactor No. 7
4. Openings - Reactor No. 7"

It would seem that the ".99" from "pg.99" is being parsed as the (invalid) track time.

Workaround:
Selecting "Advanced tracklist editor" and re-choosing the artist "pg.99" for each track via search.