I have installed 10.7.2 twice, The first time was as an upgrade. I abandoned this installation because it constantly locked up. Doing permission repairs in Disc Utility helped but not for long. I subsequently partitioned my HD (iMac 2010 1TB HD) and did a clean install. I created a new user ID and used Migration Assistant to move apps and documents. What I found was that I continued to have lockup problems particularly when opening or saving files. Upon investigation I found that my User ID was not listed on most of my drives and several of my folders or was listed with read only privileges. I then went through the time consuming process of adding my user ID with read/write to as many of these as I felt I needed. In that process I found two curiosities. One was that I was unable to add my User ID in some cases and had to add "Admin" instead. The other was that strange entities seem to have privileges. These include "system," "Everyone," "Wheel," "Fetching," and "staff." I wonder if the "Wheel" is the spinning beach ball. It certainly seems to take control of my machine a lot more with Lion than it did with SL. But more seriously, of this group only "system" and maybe "everyone" seem appropriate to me as having been added by the OS. Can anyone tell me what the others mean and do I really need them or can I eliminate them? I also have a strange result if I do permission repairs in Disc Utility. If I do a repair, then do it again back to back the same files come up. Is Disc Utility failing to do it's job. A screen shot of a partial repair is attached. The files are always the same. Thanks for any help. My Lion 10.7.2 is a lot better than a few weeks ago when it made my iMac unusable but somehow I don't think it is all right yet.