Mod_auth_apple overrides htaccess?

Question

I am migrating from Linux to Mac OS X Server and have run into a problem.
I have successfully set up a htpasswd file with authorized users (quite a lot of users that have accumulated over the years) and have the .htaccess file pointing to it as setup on previous systems. It works fine for most clients connecting. But a few clients are getting:
*{"The remote server returned an error: (401) Unauthorized."}*
At a closer look at the error_log I see the following for all connections (even successful requests):
*modauthapple: User my_user: authentication failure for "/webapp/index.php": User not found by checkpw*
So the problem seems to be that modauthapple seems to shut out some users I have granted access though my .htaccess setup.
My question is: How can I override or turn off the modauthapple authentication so that they don't talk against each other?
Note: I made an attempt to disable the modauthapple module and instead enable the modauthbasic module, but I get:
*HTTP request failed! HTTP/1.1 500 Internal Server Error*
Is there another module I should activate instead?
My .htaccess file looks like this:
*AuthType Basic*
*AuthName MyWebApp*
*AuthUserFile /Library/WebServer/WebApp/authorized_users*
*require valid-user*
Thank you.

Answer 1

I made an attempt to disable the modauthapple module and instead enable the modauthbasic module, but I get:
*HTTP request failed! HTTP/1.1 500 Internal Server Error*
Is there another module I should activate instead?
My .htaccess file looks like this:
*AuthType Basic*
*AuthName MyWebApp*
*AuthUserFile /Library/WebServer/WebApp/authorized_users*
*require valid-user*