Garou & Denis,
Thank you so much for the quick responses!
I too thought it had to be a block issue but it turned out that Denis is correct.
I did have my start page set to pages without specifying the actual page to show. Once I changed this setting the Available Categories dissappeared.
I am embarrassed to tell you that I literally spent hours (probably at least 4) trying to fix this before I posted my plea for help.
Thank you both again for all your help.
BTW - Garou, your English is very good. I understood your meaning perfectly. Thank you again.