Why do my disk permissions keep changing?

can someone please tell me how the permissions on my Macbook keep geting corrupted under normal use?   have been programming and traching UNIX in some form or another since 1983. I have never seen anything like  the conditions in OS X where this happens continually.
The disk repair messages seem absolutely bogus. Ho can something be listed as a file rw-r--r-- aand then say it is supposed to be a Directory! (drw-r--r--)
There has to be some kind o bug or OS X developers are very lax with their install/modificaton scripts.
Can someone enlighten me on this??
Ed Kenny

I would seriously like to know the answer to this as well.
I never had a problem until recently. I am running 10.8.3, but have been for some time now.
A few weeks ago, I had an issue with permissions, came to the forum, saw someone's suggestion to "get info" and change the permission level. Somehow my name had been removed entirely and it was under something else like guest or something.
Tonight, I am working on labeling and moving some of my son's vacation photos - photos first installed over a year ago. I have been working on this folder and these photos, opening, viewing, moving, renaming etc. for 2 days - the same origin folder - with NO problem. Tonight, suddenly, several photos in, the next 3 photos in line say I don't have permission. It suggests I do "get info" and change the permissions. I do this, and there I am, my user name clear as day with both read AND write permissions already! I have read and write permissions visible for both these photos as well as the folder itself and even the dang hard drive and still it isn't letting me access MY files!
MacBook Pro, Mac OS X (10.8.3).

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