@wang, about your issue of finding certain operations in the Admin give you the error, "There was an error accessing this page, check logs for more details.", there is indeed a workaround for that issue.
Basically, it's a duplicate cookie problem for the CF session cookie(s). There are in fact a few solutions to that, and I discuss the problem and those workarounds in a blog entry I just created:
'CF911: Solving problem in #ColdFusion Admin getting "error accessing this page" on certain actions'
Hope that may help you and other readers here.