Some chat with @AdobeCare - see this update to the post. Still not solved though
This is an issue I've been having since my previous iMac and Lightroom4/Photoshop CS5.
Photoshop simply can't open raw files.
I've had this on my old iMac with Lightroom 4 and Photoshop CS5.
I currently have this on my current iMac with Lightroom 4 and Lightroom 5 with Photoshop CS6, Photoshop CC and now Photoshop CC 2014.
I also have it on my macbook pro with Lightroom 5, Photoshop CC and Photoshop CC 2014.
This affects DNG raw format files that are originally from:
Open raw file from Lightroom in Photoshop. Photoshop starts but no image opens.
Non-raw files work fine. It's just raw.
I can also repeat this with bridge instead of Lightroom. Same error.
I also see strangeness in Adobe Photoshop -> Automate (photomerge and merge to HDR pro) - again - it can't open raw files.
I have no idea. The multiple machine issue makes me wonder if it's something to do with my account. Just guessing tho.
I've tried trashing my adobe prefs - no help. I tried installing on the macbook pro (clean osx install). This helped for about 10 minutes. Then back to the same issue.
Last thing I did was to uninstall every adobe app I had on my iMac then reinstall just those I currently use (Lightroom 5, Photoshop CC 2014, InDesign CC 2014). Still no help.
Currently I have to export from Lightroom as tiff to same folder, sync the folder to get the tiff into Lightroom and then open in Photoshop. Means that you lose a lot of the continuity, and means that the library is getting lots of odd duplicate tiff files. Cam
No idea :(
I've tried asking in the forums - no-one could give me a fix.
I've tried today using adobe's support help chat.
Rinse & repeat. Tried both chrome and firefox.
Long back and forward with @AdobeCare on twitter. Came down to "reinstall adobe camera raw". Only issue is I can't find a later ACR than 7.1 on the downloads page. Only the DNG converter.
Since Photoshop CC 2014 comes with 188.8.131.52 Camera Raw - 7.1's not going to work.
Now - I did reinstall the DNG converter.
Now - if I open raw files from bridge or Photoshop File > Open I get them in Camera Raw and can open them from there in Photoshop.
But opening from Lightroom and the broken Automate actions - these still fail.
@AdobeCare suggest that now I need to use Chat (which I'd already tried) or phone (which as far as I can see from the page they linked me to requires payment since I don't have some kind of enterprise agreement).
So - no real progress then - since editing the original raw files is kinda useless for a Lightroom user who starts with edits in Lightroom.