Problem with other app in WP subdirectory

I’ve got WP installed and working fine in the root directory of my site. I’ve also installed another package (phpSurveyor) in a subdirectory. When I try to access the admin area of the subdirectory, I get a not found error 404.

I think it’s because the admin directory for phpsurveyor has an .htaccess file with Auth info to protect the directory…

I tired moving the Auth info into the WP .htaccess file, but then, of course, was asked for a username and password. I tried changing it to include the <Directory> of the admin folder, but then the site didn’t work at all.

So, if I’ve got wordpress here:
https://research.multipleangles.com

and phpsurveyor here:
https://research.multipleangles.com/surveys

how do I get it all to work together so that I have an .htaccess file with Auth info here:
https://research.multipleangles.com/surveys/admin

Thanks,
Scott