Sean,
Since last Sunday, I am experiencing inconsistent behavior with the "Mark All Read" button in the upper left of the nav bar. Sometimes it clears everything, but most often not. Has anyone else remarked about this? The forum-specific button seems to work consistently. I noticed this because threads I'd read previously with no new posts were still showing up highlighted as if there were new posts. The dates of last post went back to Sunday March 13th. when I knew I'd cleared those since then. Thanks.