I've just replaced the computers in our school computer lab with new iMacs (OS X 10.8.4).
When my students log into their network homes accounts they are unable to add printers. The Network Homes accounts reside on an XServe running OS 10.5.8 server software.
The students open system preferences, but when they select ""Print & Scan", system preferences locks up with "Loading Print & Scan.." at the top of the window. System Prefences becomes unresponsive and we have to force quit. This happens on every computer running Mountain Lion and using Network Homes. Things still work normally with Network Homes clients using systems other than Mountain Lion.
Apple says that they have had no other reports of this type of problem.