IMac display doesn't stay asleep when hot corner activated

Hi,
I'm having the same problem mentioned in this archived thread from three years ago:
https://discussions.apple.com/thread/1323073?start=0&tstart=0
I have an Intel 27" iMac that I bought brand new last year. I have a hot corner set to sleep the display, but after it's activated it usually comes back on after a few seconds. It's really frustrating.
If it's just mouse jitters (I have the wireless Magic Mouse that came with the iMac), I don't understand why the hot corner area is so small. It seems like it's just a pixel large. Is there any way to make the hot corner area bigger so the mouse has to be moved a wider distance to come out of the hot corner?
Or if it's certain programs activating the display, how do I figure out which programs are doing it and is there any way to prevent all programs from doing that? If I'm choosing to sleep my display, I want it to stay that way and I don't want it to come on even if I have an iCal reminder.
- Bart

rfarwell5 wrote:
there is no activity besides the encoding that is waking up the monitor. I
How can you be sure? It may be some system operation that's doing it.
This may also prevent the display from sleeping, but the next time you're doing this you might launch Activity Monitor and order the process list by CPU. Then when the display wakes up, note what processes (besides the DVD encoding software) are using non-trivial amounts of CPU time.

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rfarwell5 wrote:
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