There is a bug in TinyMCE which makes it unusable for IE. I attached a patch since I have not the rights to commit to the TinyMCE code... I also filed the issue at their Sourceforge tracker
Patch:
Index: tiny_mce_src.js
===================================================================
--- tiny_mce_src.js (revision 39628)
+++ tiny_mce_src.js (working copy)
@@ -1571,7 +1571,7 @@
return;
}
- if (tinyMCE.isRealIE && window.event.type == "readystatechange" && document.readyState != "complete")
+ if (tinyMCE.isRealIE && window.event && window.event.type == "readystatechange" && document.readyState != "complete")
return true;
if (tinyMCE.isLoaded)