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Greetings - Thank you for the response.
I looked at what you stated 'notifications.php' only includes 'mainfile.php'.
So based on my previous experience with the 'booklist' module causing a blank page for notifications I decided to reinstall the site in a different directory.
I installed the Web Links module.
I created an additional registered user and set up notifications for Web Links for the administrator and my registered user.
End result after a bit of testing is that notifications and comments are working properly on the new site.
The only thing that I can conclude is that one of the installed modules is destroying my ability to post comments. So I will proceed carefully when rebuilding the site and test to make sure that the comments and notifications still work after each 3rd party module install.
A couple of good things came out of this. I understand the debug options a bit more, and I will be more carefull about the integrity of the modules that I install.
It seems that some of the more popular modules have not be run under debug by their respective authors to see if they have any undefined constants and/or warnings.
Live and learn.
And once again, thank you to all that responded to this thread. Your assistance was greatly appreciated.
