Adding PHP Server Behaviors Causes Dynamically-Related Files to not be discovered

All,

I know there are many posts about dynamically-related files failing to be discovered.  Most of these posts involve some CRM, and configuring for those.  I'm not using a CRM; all I'm trying to do is add a basic login page to limit access to a couple of pages on my site.

I'm using a remote server for development and testing.  Most of the other posts also seem to be using MAMP/WAMP.  The site works flawlessly until I use Dreamweaver to add login and authentication from the Server Behaviors menu.  The pages start displaying some version of "An unknown error occurred while discovering dynamically-related files."  I've tried moving the pages to their own directory, rename them, move them to the root directory, etc...  Nothing seems to overcome this.  The problem is directly related to the php server behavior since I can remove the php and load the page in any of the mentioned places.  This is enormously frustrating!

The site is defined using:

/var/www/html/ folder on the server (this is the only site on the server)

http://129.2.12.16/

I connect via sftp.

Any suggestions are greatly appreciated!