OK...I finally have everything working again -- to everybody's satisfaction.
How? Basically, by starting over.
First, I deleted Safari. Based on many things I have read (and by process of elimination), I determined that the Safari beta just might have been contributing, if not causing...
It seems as if nobody has a clue what to do about this problem.
I am able to print, preview, etc., with no problem but my wife and daughter cannot do either when they log into their accounts.
I am running 10.2.3 and I also have Safari beta v. 51 installed.
Again, I'm having no problems -- but...