Comment 2 for bug 28336

I can definitely confirm all parts of this issue that the OP mentioned on Ubuntu Breezy.

I frequently share my box with another user, having both of us logged in simulateneously using the "switch user" option.

The rule that determines which user becomes owner of the mounted device (CD-ROM, USB storage device) seems to be completely random, e.g. today I put a disc into my drive two times in a row and each time the ownership rights switched.

This bug shows up with different desktop managers, too, i.e. one user using GNOME while the other uses KDE.