It works fine with me (LR4.1 RC2, but previously used RC1, LR4.0, LR3.6... all worked the same).

I have a wide-gamut HP LP2475w (approx Adobe RGB  gamut) and a Samsung193P (approx sRGB).  Both calibrated/profiled with Color Munki Display, but I've previously used Eye One and Spyder units.  After calibration/profiling, LR main and secondary display look the same in both Loupe and Develop view, and no matter which is LR's primary display.  (Obviously, colours outside sRGB gamut don't look the same!)

I've just checked, and it still seems to be the case on my set up (W7 64-bit). 

I can't think what the problem might be.  I guess you've checked in Control Panel / Color Management that the correct profiles are assigned to each monitor.  And I guess that you've got a video card with dual LUTs that allows separate calibration (mind you, I've never come across any cards that don't have separate LUTs, but apparently there are some). 

PS - Web view might be different, as I think LR uses IE for rendering in web view only, and IE doesn't colour-manage properly. 

Dorin Nicolaescu-Musteață wrote:

 

Known bug.

So why don't I see it, or maybe I'm not looking for the right thing!  What is the bug, please, Dorin?

Thanks for the link. 

It happens occasionally for me, but not repeatably.  I tried a number images, and just sometimes (after altering a slider in the basic panel) there was a colour glitch consistent with colour management not operating on the 2nd monitor.  Going back to Library and then back again Develop always fixed it.  Clearly needs fixing, but I can't complain if I hadn't noticed it in many hours of dual-monitor work on LR4!