Did you try entering the URL in the URL admin to see if you can disable plugins that way?
Yes. I was able to successfully disable plugins using the URL admin. [Nice trick]
After disabling the plugins on the post/page edit screen do you see an entry in the wp_PO_post_plugins database table with the url of the post/page?
I used myPHPadmin to browse the database entries for wp_PO_post_plugins. I found that the URL for the page I was editing was incorrect. I am not sure if I had changed the parent for the page at one time, but the URL did not get updated in the DB, and was missing part of the new address.
I directly edited the URL from within myPHPadmin and was successfully able to disable the plugin. All changes being made to the PAGE editor, are now displaying correctly in the DB.
Now the your plug-in is back to working as it should be. Thanks for pointing me into the right direction.