I have installed dbman and when I go to the URL
http://ah.web2dave/cgi-bin/dbman/db.cgi
I get both the login screen and the following msg:

DBMan encountered an internal error.

CGI ERROR
=====================================Error Message : Debug Information
Script Location : /home/davln/public_html/ah/cgi-bin/dbman/db.cgi
Perl Version : 5.006001
Setup File : default.cfg

Form Variables
-------------------------------------------

Environment Variables
-------------------------------------------
DOCUMENT_ROOT : /home/davln/public_html/ah
GATEWAY_INTERFACE : CGI/1.1
HTTP_ACCEPT : */*
HTTP_ACCEPT_ENCODING: gzip, deflate
HTTP_ACCEPT_LANGUAGE: en-us
HTTP_CONNECTION : Keep-Alive
HTTP_COOKIE : cprelogin=yes
HTTP_HOST : ah.web2dave.com
HTTP_USER_AGENT : Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)
PATH : /sbin:/usr/sbin:/bin:/usr/bin:/usr/X11R6/bin:/usr/local/bin
QUERY_STRING :

I have looked through a _lot_ of posts in the forum
and have not found one with this exact situation.
I can't tell what is wrong, based on the debug msg.
Is there a resource available for figuring out what
to do when this debug msg is displayed?

Turn off debugging in your .cfg file if everything is working.

Also when you call the script include the name of the db filename:

http://ah.web2dave/cgi-bin/dbman/db.cgi?db=default

Change default to whatever you named your database.

Unoffical DBMan FAQ

http://creativecomputingweb.com/dbman/index.shtml/