I have heard that using a hosts file can cause you to no longer be able to connect to certain websites

It can indeed be a problem with the Windows hosts file where you are unable to get to certain websites because of obsolete hosts file entries. TweakMASTER is designed to automatically update your hosts file at any interval you select, and uses an innovative technology to add sites to the list and delete older less used ones out the back end. Or you can leave the hosts file editor (DNS Accelerator) disabled entirely if you like; disabling it would remove all TweakMASTER made entries in the hosts file.