Hi,
If I use the GUI switch user feature, so that two users are currently logged into the same PC, graphically (and you can switch between them using CTRL+ALT+F1 and CTRL+ALT+F2), I frequently find that whenever I plug in a USB drive, or SD card, that nothing pops up on the login that I'm using. It nearly always pops an authentication window on the other login.
It doesn't matter which one I'm currently using, it nearly always uses the other one. Surely the system knows which one is currently on- display, and should use that one?