I bought this printer as it offers a good range of control over print output, since upgrading to Mountain Lion, trying to access these controls from within the print dialogue box instantly crashes whichever program I'm in (MS, Adobe etc).
I have downloaded the recent HP printer driver update from Apple but this has made no difference.
I guess I'm wondering whether this means the K850 is no longer fully supported or whether anyone has a workaround.
Cheers.
HP Officejet Pro K850, OS X Mountain Lion