If you return to Net Nanny for Mac, are the changes you made to settings of the user which is not filtering still as you left them, or did they revert back to the default settings? If they did revert back, use the "Disk Utility" program in the "Utilities" folder inside the "Applications" folder to "Repair Permissions" on your hard drive. This will usually solve this problem.

Are you using any type of "web accelerator" software? These packages often act as proxy servers that run directly on your machine and use the address "localhost" to route your web requests. Net Nanny for Mac does not filter the "localhost" address due to the problems that this may create for the operating system. Some web accelerators can be reconfigured to use another address.

This problem might be caused by your browser's cache settings. When you switched to filtered access, your browser still had the pages you want to filter in its 'cache', and, rather than reload the page from the internet, it reads the page from its cache files on the hard drive. The browser cache is separate for each user account on the Mac.

In Safari, there is an "Empty Cache" command under the "Safari" menu at the top of the screen; other browsers have a similar command. Use this to remove the cached pages.

The cache feature of browsers was developed as a way to speed Internet access at a time when most users were using slow dial-up access. If the browser could read the files from the hard drive rather wait for a download each time a page was asked for, it would appear much faster.