Solution seems to be at hand:
Since my last post about the printing problems I was having with CS5, I think it has been resolved. But to be quite honest with you, I'm not sure what has solved the problem, yet I want to share with everyone two things that I did today that by themselves might have been the solution, or perhaps together, made for the solution to my printing problem.
1. After filing a Support Case with Adobe about my situation, the first thing they had me do was this:
"Select the Adobe Photoshop CS5 application file, installed by default in the Applications/Adobe Photoshop CS5 folder.
Choose File > Get Info, and if Open in 32 Bit Mode is selected then uncheck it and if Open in 32 Bit is unchecked then select it .
Then try to print from Photoshop CS5 and let us know the result."
When I selected my Photoshop CS5 app. file and looked into it as suggested, the "Open in 32-Bit Mode" box was NOT checked, so I checked it. Then I did some four test prints with varying results.
Two test prints were done with PSD files that were printed out 8" x 10". Both of these prints were perfect. So I had success here.
But then I printed two test prints of another PSD file that were 13" x 19" in size. Both prints were bad, just as they had been earlier. So did the checking, or unchecking of the 32 Bit Mode box solve anything? I'm not sure.
2. Here is the second thing that I did, in particular with the PSD file that prints out 13" x 19".
Previously when I was printing this file out, I would set the Paper Size to "My 13" x 19". This was a custom paper size I had created that was exactly 13" x 19". After doing the last 2 prints that failed, I got looking at the other options I had for printing 13" x 19". One of them is called Super B (13' x 19"), yet it also says it's 12.95 x 19.01. Why that is, I don't know, yet this time I selected it, then scaled it to 95% then hit print to see what would happen…and there it was. A beautiful print on 13" x 19" paper. Something I hadn't been able to get using CS5.
Was this the problem all along, or did the 32-Bit Mode box NOT being checked off have something to do with it? You know, after all of this, I'm not sure, and I'm a bit embarrassed to think all of this could have been my fault too, yet I'm greatly relieved that it isn't a software or hardware problem that I was having. So if anyone has any thoughts on the things that I've shared, I'd love to hear them to wrap this all up.
Thank you everyone who has offered me assistance with this problem.