Using LR CC on OS X 10.10.4. Whenever I try to use the 'Photo Merge' command for either panorama or HDR I get an error message saying "unknown errors occurred". If I take the images into PS as tiffs, then merge to pano or HDR works fine, but I want to use LR to keep dng files. I raised this issue on a chat session with Adobe on May 22 when I was told it would be fixed in next release of LR CC -- next release didn't fix issue, I still get same error (case #0186669986). Raised issue again in another chat session with Adobe rep on July 16 -- as requested, I uploaded a set of my images that generate the error, but have had no response (case #0186848023). Have had no response from Adobe to this issue, how do I get it resolved? -- are there any fixes out there?
This just started happening to me today. I did an update yesterday and this is the first time I am attempting to do an HDR merge since then. I was doing them fine three days ago...
Same with me I am unable to do a photo merge.
Edit: I think I might have figured it out. I was right clicking on the stack of photos to do the merge and it wouldn't work. I expanded the stack selected all the pictures and tried again and it worked.
I think it has an issue with stacked photos.