I reset password. That was the first thing I did, two days ago.
I reset the PRAM (Apple CSR suggestion).
I deleted iCloud from the computer.
I deleted iCloud from the iPad.
I put it back on the computer.
I put it back on the iPad.
I sent a verification from the iPad to the computer.
Twice.
I created a new ID.
I reset that password.
I went back to the old Apple ID.
I deleted the appstore com. folders.
Nothing.
Oh, and this doesn't work in SAFE MODE either.
I created a new user, and that goes to the AppStore, no problem.
I have another user on the computer, changed that to ADMIN and it also will launch AppStore, No problem.
I can switch to either USER B or USER C at anytime, including still being logged on with USER A, and the AppStore will launch. If I attempt to go to the AppStore with USER A I get, "There is a problem signing on to the server."
So, though "wouldn't hurt to reset the password" is equivalent to "is it plugged in" I still cannot access the AppStore from this particular USER (which is the main Admin user). But, other than reformatting the entire hard drive in order to use the AppStore, any other suggestions I'll consider. Thank you for your interest. I will definitely share the solution if there ever is one. :-)