This seems to be a bug related to IE. I made a decision, and it works * ( * IE needed a .cur file to work ); but first let's get DEMO first.
In this example, I used the disabled attribute to disable textarea , because you are using cursor:not-allowed , which gives a reading of this disabled field.
Download this PNG image and convert it to (.cur) using this online tool

CSS is used here.
textarea[disabled] { display:block; cursor:url('http://www.dolliehost.com/dolliecrave/cursors/cursors-cute/cute25.gif'), url('cute25.cur'), wait; background:gold; }
In the HTML, I turned off textarea , which makes more sense here.
<textarea disabled>This TextArea is disabled</textarea>
NOTE. I have no way to test IE, but it should work.
Kheema pandey
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