When attempting to change the color of some text in Acrobat Pro DC, the text format is sometimes badly messed up. This happens with text from Acrobat's OCR as well as text imported from other applications. I'm attaching a file that shows both of these cases. To reproduce the problem, open the file in Acrobat Pro DC (on Mac), select Edit PDF, select all of the text on the page, and change the color of the text to black - the text format will get badly mangled when the color is changed. Very frustrating! Changing the color should just change the color, and not mess with the text layout.