Could you please let me know the exact version of Lightroom installed on your computer?
Also does it happen with DNG file format or did you check any other RAW file format?
What are the external editing preferences set for in Lightroom?
Make sure that you have chosen Photoshop under Post-processing > After export at the bottom of the Export dialog.
And a PSD file should open in Photoshop, not Camera Raw.
I finally was finally able to get the image to open in PS (I found a, obscure place in the export dialog where I could choose my image editor, BUT...ACR is not an option!).
Normally, the export flow would and should have been that a 16 bit image, when exported from Lightroom, is supposed to open in ACR, where I can edit it, and then have an option to process it as a Smart Object when opened in PS. ACR is no longer part of that workflow. Instead, I need to use the ACR filter from Photoshop first, and there is no option in ACR when going with this workflow.to process the edited image as a high-res smart object any more.
How do I restore Lightroom's export dialog to use the ACR external editor when opening 16bit images?
By the way, I am using Lightroom CC2015, PS CC2015. Lightroom lists ACR verion 9.5 I can not find the ACR version for PS.
The mandatory external editor for lightroom is PSCC2015 (there is no other choice at the top portion of the dialog). Other external editors listed as secondary post export editors are the various NIK applications.
The editing you can do in ACR can also be done in Lightroom, so there is no point in opening an exported image in ACR.
Lightroom has ACR built-in, and you would typically do edits in Photoshop that can't be done in LR or ACR.
And the preferences for External editing has no effect on exported files - external editing will open a rendered (Tiff or PSD) copy of the file in Photoshop, and return it to Lightroom when you finished editing.
To find out what version of ACR is used by Photoshop, go to Help > About Plugin > Camera Raw.
In the past a 16bit file exported from Lightroom opened Photoshop and Photoshop then automatically opened ACR to display the image. At the bottom of THAT ACR window was an option to open the PSD as a Smart Object in PS (at a optional resolution, e.g. 300ppi or something else). That workflow has changed, whether or not that was the appropriate sequence of external editing or not. What changed?
Also, I don't think my edited (in PS) exports are automatically returned to Lightroom. They are saved in a different folder of my choice.
My ACR in PSCC 2015 is 18.104.22.1685
The only way I can get an exported image to open in ACR is to export as Original or as DNG.
When you go on to open the image in Photoshop, it will open as a generic file with no extension.
When you save it, you choose a file format, like PSD or Tiff.
My guess is that you previously used to export as Original or DNG.
As for the Smart object part, I don't use it, and can't comment on it. But I see there is an option in ACR to open as Smart object.
You're correct!! That's what I must have been doing...exporting as dng. I didn't realize that when I made my pref selections on the export dialog.
I am happy now...at least I understand what's going on, finally.
Thank you all!!