The difference that you see in the Library and Develop Module,is that the Library Module shows the image in sRGB Color Profile, however in the Develop Module they are in ProPhoto RGB.
Did you calibrate your screen?
If your calibration is OK, it should show the same.
First, I did calibrate the screen, though I haven't updated it in a while.
I guess my fundamental question comes down to...when I publish my dng file to SmugMug, it ends up looking like the ProPhotoRGB version, despite the fact that they supposedly convert it to sRGB. Do you know what causes the distinction between the sRGB preview in my library when compared to the sRGB file in SmugMug? Both are viewed on my same monitor, so I don't see how it would be an issue with my calibration (but I admittedly barely understand colorspace).
Thanks for the replies!
These symptoms can occur when you have a display profile set that's incompatible with LR. Such problems have been striking Windows 10 users recently. To quickly troubleshoot this, change your display profile to sRGB, as described here: How do I change my monitor profile to check whether it’s corrupted?
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Next to the already mentioned issue with some monitor profiles, typically those installed by driver updates, there is another issue that can cause these differences, which is the use of the GPU in Develop. Try turning the gpu acceleration off in Lightroom's preferences. Also, when you calibrate your display, it is generally safest to have it create a v2 icc profile if your calibration software allows for that.
To clarify, the LR Library module uses Adobe RGB JPEG previews and the Develop module uses the Melissa RGB colorspace (ProPhoto RGB with 1.0 Gamma). Even with a wide gamut monitor it is very unlikely you will see a color difference between the two modules. As johnrellis mentioned one the things that will cause a difference is when there is an incompatible profile assigned to the monitor. It appears the Windows 10 Upgrade automatically assigns an OEM monitor profile. The best solution is to recalibrate your monitor and make sure its software preferences are set to create an ICC Version 2 Matrix profile–Not an ICC Version 4 or LUT profile.
Thanks for all the replies. I actually did recently update to Windows 10 (probably should have mentioned that!) and it looks like it stomped on my previous calibration. I did the recalibration, per your recommendations, and now the developer/library images look the same.