Just tried and it worked fine from windows 7 x86 and Windows 10 x64 with the latest driver from EFI here.
The issue you are seeing does happen if you have the wrong driver (1.0 on a 1.2) I have heard. Also, don't use the driver from Xerox.com when you have an EFI rip, that tends to be an issue.
There are occasional issues where page numbers become a problem with EFI, and since you mention duplex, I will quickly sum that issue up.
Say you have a 10 page job and you set a slip-sheet after page 6.
Simplex should be printed 1,2,3,4,5,6,slipsheet,7,8,9,10
Duplex should be 1-2,3-4,5-6,slipsheet,7-8,9-10 when thinking of the pages digitally. But..
I have seen drivers from EFI consider it in physical sheets instead of digital pages. So the 10 page job is actual 5 physical sheets duplexed, and in that case the print job never makes it to the "page 6" to add a slip sheet, so it just doesn't add it. Usually a driver update will fix this.
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Joe Arseneau
