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Just wanted to throw that out there. Created a SR on it, as I have done for every release for the past several years now. I've been a Revit user since version 6.1 in 2004 and Collate has NEVER worked. It's ridiculous, really. Just remove the option if you're not going to fix such an obvious function that ALL other programs have.
I'll second that (and submit a SR for fun). I just export to dwf and print sets from there, but collate, like text, is a basic function that should work by now.
I have 2014 Revit and it does not work. I have had all other versions never worked there either. You would think Autodesk would fix this. Very inconveinient.