Hi Shaun,
I Just tried with my configuration and it just works fine. Try removing the "config.". This is my configuration:
"toolbarGroups: [
{ name: 'clipboard', groups: [ 'clipboard', 'undo' ] },
{ name: 'editing', groups: [ 'find', 'selection', 'spellchecker' ] },
{ name: 'links' },
{ name: 'insert' },
{ name: 'forms' },
{ name: 'tools' },
{ name: 'document', groups: [ 'mode', 'document', 'doctools' ] },
{ name: 'others' },
'/',
{ name: 'basicstyles', groups: [ 'basicstyles', 'cleanup' ] },
{ name: 'paragraph', groups: [ 'list', 'indent', 'blocks', 'align', 'bidi' ] },
{ name: 'styles' },
{ name: 'colors' },
{ name: 'about' }
],
removeButtons: 'Subscript,Superscript',
format_tags: 'p;h1;h2;h3;pre',
image_previewText: ' '
"
Here you can see how it looks.