And how does one "rebuild the cache in the control panel"? Are you referring to the "Tools & Info/Clear Cache" utility? I also looked in the "Tools & Info/Content Rebuilder" items and there isn't anything there that mentions "cache".
One other quick question... I have two "index" files: index.html and index.htm. Should both of those be retained when manually cleaning out the cache folder? or is the index.html file the only one to retain?