Wow. I just searched for this problem because I just set up a new monitor arrangement. I now have 3 identical, color calibrated monitors. I have LR in the middle, and the "2nd" according to Adobe is to the left. I suppose I will use the not-quite-full-screen method mentioned, I suppose that is a reasonable workaround--to a pretty silly bug. I also concur with the person that wants the main workspace on one monitor and just tools and such on the other. It seems that Adobe put in 2 monitor support in to say it is an additional feature, but hasn't really updated it since its inception. I don't understand the comment about "just have 2 color calibrated monitors and you don't need a 3rd." Why does that remove the requirement for an additional monitor? For other reasons I think I will be going back to Capture One anyway, which I started using a long time ago. I just have to watch some tutorials on the new version (which I have) and play with it to figure out my workflow. BTW, the other issue is when using the second monitor as a live loupe it doesn't always focus the image (like it never quite finishes loading the higher resolution preview). It seems to be random. I've almost discarded images before permanently from this (I use this to quickly evaluate focus on many images). Obviously I don't use that for the delete decision any more (and thankfully I discovered the problem before I actually deleted anything permanently). I contacted Adobe about that and they blamed my video card. Huh? That doesn't even make sense. Plus, now I've seen it on 3 very different systems with 3 very different video cards. I will probably open the ticket again, but don't have really high hopes. ... View more

Oh, I agree with that! But at least this will get the functionality back. ... View more

This is the solution: it assumes you are using CACKey, but can probably be translated to other middleware: Verify permissions of /Library/CACKey/libcackey.dylib are correct; they should be -rwxr-xr-x (755) and owned by root, group admin. If they're not, change them using Terminal.app: sudo chown root:admin /Library/CACKey/libcackey.dylib sudo chmod 755 /Library/CACKey/libcackey.dylib In Adobe Reader DC, open Preferences, then go to Signatures --> Identities & Trusted Certificates --> More... Cick "PKCS#11 Modules and Tokens" Click "Attach Modules" Enter path to your PKCS#11 module; for CACKey this is /Library/CACKey/libcackey.dylib Click "OK" Click the little triangles to open up the module until you see the card Click the card Click on the email signing certificate (look for one issued by DOD EMAIL CA-xx and includes Intended usage of Digital Signature) Click the "Usage Options" popup menu and select "Use for Signing" Click Close, then Click OK. The above steps will need to be repeated for each user account on the machine. If you're using something other than CACKey, then you'll need to determine the path for your PKCS#11 module. If you have Firefox or Thunderbird installed, then it's the same as the one you have configured in those applications in order to use your CAC. Once this configuration change has been made, the signature dialog box will change slightly to include a field to enter your PIN (or as Adobe calls it, "certificate password"), as shown in the screen shot below. You'll need to enter your PIN here, rather than clicking Sign and then getting the standard OS X dialog to enter your PIN. ... View more