Library and Develop render images differently. The short answer is that Library will render for speed and rely on already built previews. Develop, on the other hand, will build a preview from the raw data and update it as you make changes. Additionally, I believe the colorspaces used by each are different and some colors that in in gamut in Develop may be out of gamut in Library.
I don't see it being "fixed" and maintain speed in Library. But, as computers get more powerful and new algorithms are created... Who knows?
What version of LR and OS are you using? Do you hardware calibrate you monitor?
The Develop module uses ProPhoto RGB colorspace and Library module Adobe RGB. Even with a wide gamut monitor you shouldn't be seeing any significant saturation or hue differences between the two modules. Try clicking on the image in the Library module to launch it in 1:1 view and have it rebuild the preview. If using LR 6/CC try unchecking 'Use Graphics Processor' in LR Preferences> Performance tab:
I am using Lightroom 6.1 on Windows 8.1. The effect only occurs at “fit to screen” display where a higher saturation is shown in the develop module compared with the Library module. It is not apparent at 1:1 magnification. Also it only occurs with Tiff black and white files from Silver Efex Pro when toned in Lightroom. Unchecking the graphics processor and relaunching Lightroom had no effect. The monitor is not wide gamut and is calibrated. The issue was not apparent with Lightroom 5.7.
Thank you for your help.
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I'm haven't used Silver Efex pro, but now understand you are working with B&W images that are being toned in LR. What you are most likely seeing is not a hue or color difference, but a "lighter" image. This appears as less color saturation since the image is monotone.
As Gene McCullagh mentioned this is due to differences in how the Library and Develop modules render the preview images at less than 1:1 view. If a high ISO image is over-sharpened and has insufficient Luminance Noise Reduction applied it may appear brighter and less sharp in the Library module at less than 1:1 view (i.e. Fit view). Fortunately there's an easy solution as explained here:
If this doesn't "fix" the issue then you may have an incompatible monitor profile (ICC Version 4 or LUT type):
Thank you very much. I think this fully explains it. The image was of a barley field with lots of detail which I may well have over-sharpened in google raw and output sharpener. Much appreciated.
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The image was of a barley field with lots of detail which I may well have over-sharpened in google raw and output sharpener.
If the image is processed (i.e. over-sharpened) in another application such as Google raw, exported to JPEG or TIFF, and then imported into LR you shouldn't see much of a difference (if any) between Library and Develop Fit views. It's only when over-applying Sharpening and insufficient Luminance NR in LR's Develop module. Check those settings in LR for the images with the issue and adjust as outlined. If they've already been sharpened in another application you shouldn't need to apply any LR Develop Sharpening. If resizing images (i.e. smaller) on Export use the Output Sharpening settings in the Export module to establish the degree of sharpening desired. Increasing the Develop module Sharpening settings has a lesser affect on resized images.