Last modified: 2011-04-14 15:12:36 UTC
I was pruning some of the 1,896 pages off my watchlist using: http://en.wikipedia.org/w/index.php?title=Special:Watchlist&action=edit I loaded this page last night, went to bed, woke up this morning, and selected a bunch of pages to remove. I clicked "Remove Titles" and the watchlist reloaded without a notice at the top that those pages had been removed. Sure enough, the pages were still there, but no longer selected. This is an annoying little bit of data loss. I suspect some sort of short-term authentication is expiring?
Probably an invalid edit token, but it seems the watchlist code shows no error message in this case.