Output preview showing 1 color black as 4 color

[Bradley24443433v7hx]

I have a file using 1 color black text, but Acrobat output preview is displaying as 4 color.  Wasn't doing this yesterday.  Same files appear correct on my coworker's computers. Double checked old PDFs I KNOW are correct, and it still displays as 4 color.  I've uninstalled, restarted, reinstalled.  Trashed profiles.  Nothing is fixing it. So what happened? Did I goof up a setting? Is Acrobat DC just trash?  I've wasted far to much time troubleshooting this issue already. I need some help. Thanks.

[Laubender]

Very good point, Luke!

Turned on Accessibility > Replace Document Colors

and indeed my Output Preview is showing this:

Thanks,
Uwe Laubender
( Adobe Community Professional )

[Laubender · Accepted solution]

Hi Luke,

just looked into the Object Inspector when Accessibility > Replace Document Colors is turned on.

Then the Object Inspector will show the color values of all the Black Ink objects of the OPs PDF as DeviceRGB:

Regards,
Uwe Laubender
( Adobe Community Professional )

[AnkePiknerKraft]

Oh no, it happened with my Acrobat too! This is horrible 😞
AND I dont have Replace Document Colors turned on!

[rob day]

AND I dont have Replace Document Colors turned on!

Hi @AnkePiknerKraft , What preset are using for the Export? Try one of the PDF/X presets and check the values in AcrobatPro‘s Output Preview.