Some color pictures (in documents like pdf, word, html) print out to greyscale for HP UPD (releases PCL5 5.7 or PCL6 5.6.5, 5.7, 5.8) drivers on Windows 7 64 bit clients with OES11SP2 up to date.
If the HP UPD driver is installed in traditional mode for a local printer with TCP/IP, color pictures print out to color properly.

Thanks in advance for any idea.