Troubleshooting and tweaks Wordpress + DAP Membership Site

I already have a web site that is up and running, and I have several students using it on a daily basis. It is a Wordpress + Buddypress based web site, and member areas are protected by a PHP script called [login to view URL] Here are some things I need solved: 1- One particular page is protected from the public, but an embedded calendar is open to the public, and it shouldn't be. 2- Some students are not able to see the Wordpress functions on the web site. This is not a fault on the web site, as I can access everything with their login, but I believe something in their browser is clashing with WP. I need to find out what is causing this clash. I need this investigated ASAP. Thanks!