Switch back to The Simple HTML toolbar, reload the post page and then revert back to the WYSIWYG toolbar and see if that helps.
Otherwise it seems there is a bug in TinyMCE somewhere or BH's implementation of it, but I wouldn't have a clue where.
Yep, yep. Upgraded the copy in CVS to the latest release last night and have patched the Beehive plugins to work correctly.
Haven't upgraded the version here yet though. Will do that some time soon.