Last modified: 2009-11-16 21:16:36 UTC
Opera 10.01: start editing a page --> make some changes --> click on a link to leave the page --> press back. All changes will be lost. Occurs only when "Enable enhanced editing toolbar" is checked in preferences (I didn't test it with other UsabilityInitiative options though). Reproduceable both on mediawiki.org and prototype.wikimedia.org. No user scripts are present.
There was an issue with this before. It was fixed for most browsers, but Opera seems not to restore content for elements that are dynamically created or moved, which is a bug in Opera. *** This bug has been marked as a duplicate of bug 20221 ***