Screen dims while making adjustments

When using LR 2.3, I've recently started to notice a problem that starts to occur at some point after LR has been active for an extended period (few days?). All of a sudden --the monitor screen momentarily dims while I'm moving a slider or keying in a new setting (in the Develop module); and once this starts, it happens for any type of slider change and with any image. Then, as soon as the mouse button is released, the screen instantly returns to normal brightness. The degree of dimming is quite considerable and naturally makes it nearly impossible to assess the effect of a setting change in "real time".
The only way I've found to eliminate this problem is to quit and restart LR. The problem has never happened (to me) with previous LR versions, although I've been using LR steadily since the pre-1.0 beta days. I've been using version 2.3 ever since it became available, but I've only noticed this behavior during the past few weeks. Yes, I know it's best not to run LR (or any app) for very extensive intervals, but is there some other likely cause for this problem that I should try eliminate? Is this perhaps a known 2.3 issue?
I use a Mac Intel Mini (2.0 Ghz), 4 Gb RAM, OS X 10.5.6, NEC LCD 2690 UXi.
Phil

One reason to quit and restart LR at least daily is to back up the catalog.
I agree, however I just checked on the problem and find it has returned–but with far less than 24 hours of time elapsed since the last quit/restart of LR.
I then quit all the other programs that were running, but that didn't help. I have no special reason not to do the 2.4 update, but I, too, am skeptical that the update is likely to solve an issue that appears to be (more-or-less) limited to my own system.
Phil

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Screen dims while making adjustments

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