Unfortunately, none of your suggestions have produced any change, but it prompted me to look closer at my settings. I noticed in the Photoshop (CS6) print dialog box, under "Paper/Quality", the "Paper Type" says "Any", and scrolling down, the Custom Paper list is empty (although the "Loaded Paper" is correct), which is odd. Then I remembered I had updated my Macs OS last week from 10.8.1 to 10.8.2... the only "change" since I printed last... w/o any problems!
As soon as I re-install the old print drivers, I'll let you know if that's the problem. As always, this forum is a great resource! The willingness of it's members sharing their vast knowledge and experience is greatly appreciated... thanks again for all of your help!