I have the same problem. I trashed preferences and now the color is way off on HDR Pro. CS 6 on Mac OS 10.9.4 too.
could you also tel me what is the version of mac OS you are using, please check if there is any update for the OS
I have posted a thread noting similar problem which suddenly started yesterday using a batch of .NEF raw files. If so, have you tried running Merge to HDR using DNG versions of the raw files ? This worked ok for me on a batch which refused to process before. I also found that psd and jpeg versions passed through OK.
Anyone from the Adobe staff able to comment on why this may be happening ?
I used only photoshop instead of processing through bridge and that worked.
I think also auto aligning may be an issue. I'm still testing though. All
in all I'm going with a plugin in the future.
please check with other images if you have any
i mean a different file format raw or jpeg