404 error when attempting to reach a directory other than root. Sent to wordpress root install

WordPress multisite is installed in root. I set up WHMCS in folder “acct”. It worked well for months but now when I attempt access, I am either sent to 404 file in wordpress or the wp home page.

Researching the web I have tried various .htaccess changes to no avail.

sample: http://freemobilehost.com/acct/cart.php

sample2: http://www.freemobilehost.com/acct/admin/index.php

it seems requests to access other folders and files are being imprisoned within wordpress.

any thoughts? have you seen and resolved this before?