First time poster, but long time visitor. I have the same problem, and I'm convinced it's Windows8, but can't find the issue. I have a calibrated Dell 27" LCD, only HueyPro calibration tool, but seems to work well. When in Lightroom4, my jpg outputs look a TON more contrasty, saturated and underexposed by about 1.3 stops. I'm so stumped on it that I've literally been overexposing my photos, reducing contrast, basically working backward until I get the result I'm looking for. I looked in the windows8 under color management, and made sure I'm processing and outputting everything in sRGB, including my settings on my 5DIII and/or 7D. The kicker for me is that when I output a RAW in LR as an sRGB jpg, and re-open it in something like Digital Professional Pro, it still looks contrasty, etc... but when I go to edit the picture in the same program, it returns to it's LR-looking view! So it seems that there is some encoding being added that the program knows to remove when editing?? So confused. I'll of course attach an example: the right is LR, left is the output as sRGB jpg, just being viewed from the Windows8 file previewer. Any help would be great, I no longer want to even edit pics until I figure this out.