If you or any other 60D owner can do a hg bisect and find the changeset that broke it, it will be very helpful.
The cool thing about hg bisect is that you only need log(n) tests, so if you want to locate a bug in 1024 changesets, you need only 10 test runs on the camera to find the changeset that broke it.
I've recompiled the nightly builds roughly one hour ago; is it also broken with these builds? Just to rule out toolchain problems or custom modifications.