I've seen similar issues in the forums, but I want to put in my problem so hopefully Adobe recognizes this as a valid issue affecting many people.
We have a large format HP Designjet 1055 color plotter which we could print to with Reader 9. However, no one here can print to it with Reader X. After openning a pdf file, clicking Print, selecting the printer, then clicking OK; the print dialog box goes away, but nothing happens. Nothing is spooled to the print server. I tried printing directly to the printer (bypassing the print server), but that did not work either. The same pc's can print to all other printers.
We can print pdf's to the 1055 if we use a copy of Acrobat 9 or Nuance Pdf reader.
My customers are seeing the same issue here with plotters. Testing shows at least 2 HP DesignJet 1055c are affected; printing from Acrobat works as expected, but print attempts from Reader X go no where with no feedback. "Print as image" doesn't help, either.