To fix the problem with the media plugin (Flash, QuickTime and such), open the xconfig.js file in the TinyMCE directory and replace the contents with the following:
/**
This file is used by the MODx TinyMCE plugin to pass additional parameters to TinyMCE for processing.
*/
var tinymce_valid_elements = "@[id|class|style|title|dir<ltr?rtl|lang|xml::lang|onclick|ondblclick|"
+ "onmousedown|onmouseup|onmouseover|onmousemove|onmouseout|onkeypress|"
+ "onkeydown|onkeyup],a[rel|rev|charset|hreflang|tabindex|accesskey|type|"
+ "name|href|target|title|class|onfocus|onblur],strong/b,em/i,strike,u,"
+ "#p[align],-ol[type|compact],-ul[type|compact],-li,br,img[longdesc|usemap|"
+ "src|border|alt=|title|hspace|vspace|width|height|align],-sub,-sup,"
+ "-blockquote,-table[border=0|cellspacing|cellpadding|width|frame|rules|"
+ "height|align|summary|bgcolor|background|bordercolor],-tr[rowspan|width|"
+ "height|align|valign|bgcolor|background|bordercolor],tbody,thead,tfoot,"
+ "#td[colspan|rowspan|width|height|align|valign|bgcolor|background|bordercolor"
+ "|scope],#th[colspan|rowspan|width|height|align|valign|scope],caption,-div,"
+ "-span,-code,-pre,address,-h1,-h2,-h3,-h4,-h5,-h6,hr[size|noshade],-font[face"
+ "|size|color],dd,dl,dt,cite,abbr,acronym,del[datetime|cite],ins[datetime|cite],"
+ "object[classid|width|height|codebase|*],param[name|value|_value],embed[type|width"
+ "|height|src|*],script[src|type],map[name],area[shape|coords|href|alt|target],bdo,"
+ "button,col[align|char|charoff|span|valign|width],colgroup[align|char|charoff|span|"
+ "valign|width],dfn,fieldset,form[action|accept|accept-charset|enctype|method],"
+ "input[accept|alt|checked|disabled|maxlength|name|readonly|size|src|type|value],"
+ "kbd,label[for],legend,noscript,optgroup[label|disabled],option[disabled|label|selected|value],"
+ "q[cite],samp,select[disabled|multiple|name|size],small,"
+ "textarea[cols|rows|disabled|name|readonly],tt,var,big";
var tinymce_extended_valid_elements = "";
var tinymce_invalid_elements = "";
The problem is that the valid_elements parameter was originally set to allow for a strict set of XHTML elements. This sets it back to the default. I’ll be deploying TinyMCE configured this way from now on. With TinyMCE 2.x, it was necessary to set the elements this way since the editor tended to use markup that wasn’t standards compliant. TinyMCE 3.x is a lot more compliant and I think it’s no longer necessary to have such a strict set of elements for it.
For those who wish to learn more about this setting, see the following wiki page:
http://wiki.moxiecode.com/index.php/TinyMCE:Configuration/valid_elements