Today, i installed opera 9.0 on my notebook, and discovered, that both RTE and xinha don't work with it. If rich text editing turned on, one cannot even post a message to a forum (like with safari, not long ago). Additionally, opera has problems with mktree.js: in opera, it was showing multiple +/- signs for collapsed/opened items.
both issues were quite easy to fix, i have commited the changes both to oacs-5-2 and head. It might be a good idea to included these changes in the forthcoming dotlrn release.
-gustaf