Try to create a protected directory. When I add the 'OK' button, I receive a javascript-error. Can reproduce this error on multiple servers running PSA7.5.1 and RHEL3.0.
Mmm... Strange. If it's a browser issue, I should have problems with javascript on all pages. Attached is an image of the error I get. By the way, I'm using IE 6.0 with WindowsXP service pack2 installed.