Open the advanced editor: http://tinymce.moxiecode.com/example_advanced.php?example=true Select some text Try to use the Format pulldown menu I think this is broken because execCommand(FormatBlock, ...) expects the block tagname inside "<>"s.
*** Bug 9643 has been marked as a duplicate of this bug. ***
Works on TinyMCE dev versions, such as http://tinymce.moxiecode.com/test/examples/example_full.htm
Closing since this works on dev versions.