After the 6.5 update, I can no longer merge to HDR from images in a collapsed stack.
Previously, I was able to create stacks of images, then collapse the stacks and then I would highlight the stack, and click ctrl+shift+h to perform the HDR merge. Now when I do that same combination on collapsed stacks, I get the error "An internal error has occurred. Unknown errors occurred."
I CAN however select each individual image in an uncollapsed stack and perform the merge to HDR.
Is this a feature that was purposely taken out of 6.5, or is this an error?