Hot Corners do not seem to put Mac to sleep or activate screen saver

All was been working fine and as expected on my Macbook until the 10.6.2 update. I have left hot corner set as screen saver, and right hot corner set to sleep the display. When I go to the hot corners, sleep or screen saver is activated, but then I walk away and a few minutes later the screen comes on again...
At first I thought this was just my macbook (nothing was running but email and no external devices attached), but then It started doing this to my MacPro after the last update...exact same thing.. Then it started happening to my work iMac, then my daughters iMac and now my sons iMac. The only machine that doesn't seem to be effected is my wifes MacMini - and she is still running 10.6.1.
Does anyone know if there is an update somewhere, or how to fix this issue?
thanks

I would not regard myself as expert and you are going to get opinions for both approaches. I have just passed on a 3 year-old MacBook Pro that has never been off, apart from updating when restarts are required. Similarly, my iMac sleeps (protected by UPS) and is not turned off. I am happy this way.
I would take slight exception to your process, however. In my opinion, I put the MacBook Pro to sleep by using OptionCommandDelete (or the Apple menu) and wait until the power light pulses before closing the lid.

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You should not post your specific problem in another poster's thread. This is called "threadjacking" and is frowned upon as well as considered inappropriate by the Terms of Use. Instead you should post your own separate question topic. This is easy to do. Simply determine which forum is most appropriate for your problem, navigate to that forum and the forum's topic list. Just above the topic list you will see on the left the words "Post New Topic." Click on that link and then prepare your post in the editor. When you are finished click on the Preview button to see how your post will appear. If it's OK, then click on the Post button to post your topic.
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Hot Corners do not seem to put Mac to sleep or activate screen saver

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