Have you tried increasing the columns and rows of the description box although I think it should not matter there?
Code:
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The only issue I would see if something triggered some server restriction like I uploaded about a 1000 paragraph with no issue but when I tried to copy and paste the entire install instructions from our site to an image then I tripped my server's REQUEST URL TOO LONG error. I would assume here your triggering something similar here on the server restriction.