[chris v]

Any disk image I double-click gives me the same result

A dialog that says "Warning:" in the title bar, & in the window, lists the name of the image, & says "Reason: Broken pipe."

I've tried a re-start, (no luck) but not sure what else might be an option to try, here.

[chris v]

Here's something: Console reports " diskimages-helper crashed".

Crash reports are just gobbldygook to me, but I can post one up.

hdid in Terminal yields same result.

[chris v]

Resolved: I replaced the /System/Library/PrivateFrameworks/DiskImages.framework directory & its contents from my backup drive using 'sudo ditto' and all is well. Not sure what part of it broke.