CKEditor controls show in IE8 and FireFox but not in Safari or Opera

I have a PHP developer working on a site for me, using CKEditor 3.2, and the editing controls appear perfectly for him in IE8 (Windows) 开发者_StackOverflow中文版and for me in Firefox 3.5 (Mac). But my other browsers on Mac (Opera 10 and Safari 4) show no editing controls but only the word "FALSE" centered above the text area.

The textarea contains the "raw HTML" of the content, instead of it being rendered properly.

I'm not a programmer, my guy doesn't have a Mac, and he thinks IE8 and FF are enough!!

Can anyone suggest where he's likely to be going wrong in his call to CKEditor in PHP, given that word "FALSE" appearig where it does.

Thanks.