"Horizontal Distribute" buttons broken in Illustrator 24.2.1
Illustrator version 24.2.1 on Mac OS 10.14.6 When multiple objects in a row are selected and any of the Horizontal Distribute buttons are hit, the objects are stacked on top of each other instead of distributed out based on farthest left to right. It appears to be copying the function of Horizontal Align buttons.
Khue Bui commented
Ron's comment worked for me too! Switch it to "align to selection" and it works fine.
Ron's comment worked! Just changed alignment choice to align to selection
Same here, Ron's solution fixed the problem
SOLVED (for me): The button to the left of the alignment choices had been switched somehow from "Align to Selection" to "Align to Key Object." When switched back to "...Selection" the alignment buttons worked as they previously had. I don't know if this switch was because of a random keystroke accidentally hitting an unknown hotkey or if the default state was changed somehow during an update, but this fixed my issue.
Also broken on Windows 10 Pro