.dmg files no longer open in the finder

I just did an archive and reinstall (to solve some unrelated problems). Most things seem fine, but now .dmg files show up on the desktop without any icon, and when I double click them they open Disk Utility instead of mounting in the finder.
It's possible to mount them from within disk utility by selecting the .dmg file and clicking on "open" ... but this is an odd bunch of extra steps, and it seems like something's wrong.
in get info I tried to change the default app to the Finder, but it wouldn't let me.
I've repaired permissions, rebuilt the directory with disk warrior, restarted, etc. .. no luck.
any thoughts?

The application to choose in "get info" >>"open with" is "DiskImageMounter".
-mj
[email protected]

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