I have come across an issue when using the TinyMCE jQuery plugin and v1.4.2 of jQuery.min.js

 

Under Internet Explorer (v7 and v8), you get an error message when a page is first loaded using Tiny MCE -

'Object doesn't support this property or method'.

The highlighted code is:
a=b.XMLHttpRequest?new XMLHttpRequest():d("Microsoft.XMLHTTP")||d("Msxml2.XMLHTTP");

This does not happen under Firefox or Opera browsers, but even more oddly is the fact that this error goes away if you refresh the page.

 

I have reverted to v1.3 of jQuery, which does not exhibit this issue

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