I'd say that if a lot of pictures look too dark and you can't lighten them by turning up the brightness/contrast on your monitor, it's because you need a new monitor. They do deteriorate, and some rather quickly. Any CRT monitor older than a few years is probably far far darker than the day it was bought. Thing is that since you look at it every day, you don't notice it.

I don't know how flat panels deteriorate, I have't had mine long enough to tell, yet. But I wouldn't be surprised it it, too got darker with time. For that very reason I bought the brightest one I could afford.

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.