Thanks for all the good answers!
I finally downloaded the Phoenix viewer, went in and put the land up for sale, then logged out. Then today, after getting notice of an update to the SL viewer and doing the update, it all seems to work again.
I didn't really like the Phoenix viewer because my avatar showed up with a big nose and no matter how many times I put on my shape and skin, it wouldn't change! ~laughs~
So, it was a viewer problem, after all.
Again, thank you for all the help.