I just performed an upgrade to WP 2.1 and everything's working fine (plugins, theme etc.) except for the TinyMCE Editor. It's come up all fine and showing me the WYSIWYG & Code tabs.. but almost all the formatting buttons except Bold, Italic, Split Post & Spell-Check are all gone. Instead of the buttons I see blank spaces and some separators.
What do I need to do to fix this ?
Here's a screenshot: http://img208.imageshack.us/my.php?image=wp21editornobuttons5pz.jpg