Katin,
It was the rewrite directives:
RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php?q=$1 [L,QSA]
Once they were commented out, phpsurveyor seemed to work fine. 'Course I need them for my Drupal site :)
Note: once I was logged in, I could change the directives back and the phpsurveyor admin section continued to work. Seems strange.
Charlie