HP LaserJet 4250 stalls on 2nd page of Duplex print

Question

I work in a University IT Department where we maintain over 80 networked HP Laser printers, mostly HP LJ4250's with duplexers installed.   When students send a "PDF" duplex print job, the printer quickly prints the first page and sucks it back into the printer to prepare the other side of the page, as designed.  The problem is that it appears as tho the printer stalls and displays the processing message on the LCD screen.  The page never spits out.  If we turn the printer off and back on, the page will finally spit out, but without any print on the backside of the page.
We have tried to print by specifing the "Print as Image" option, but still the same results.  We are at the point of telling students to waste paper and print single pages just so they don't have to stand there waiting for something that seems like it will never print.
Is this a fight between Adobe and HP?  If so what can someone recommend other than waiting for Internet Explorer 9 and its version of reader?

Answer 1

Did anyone find anything on this?  It's a problem that can be duplicated, and is very frustrating.
From what I have tested, the problem only exists on HP PCL Universal Drivers.  I have not had it happen with with the PS drivers or the device specific drivers.
Furthermore, it seems that the second page on the PS driver re-queues or somthing, as there is a considerable lag on the print.  The paper sits inside the duplexer for seveal seconds before printing the second page.   It is without a doubt a driver issue in the PCL, as the Xerox Global PCL prints it just fine, but prints MS Word and outlook doucuments all wonky (as a xerox driver probably should on an HP printer).
JetDirect, Device Firmware, and Universal print drivers are all up to date on this system.  And as I stated earlier, the problem can be duplicated.