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As in the title - if you try and see the rendered diff on two docs - one of which has an invalid XML - all the buttons get grayed out and nothing happens.
Fixed in 201310021002 To test this, you can use topic 3737 revision 542432, which was saved with invalid XML. Getting a rendered diff of this revision will display an error message instead of just hanging.
Note: This version is currently live on PressGang Next.
Hours apply to 2013-10-1
Tested this again, and had to make one small change to the message that was displayed when the error occurred, but this can be called fixed.