Problem with screen

Trying to run screen on a Fedora 3 box whith the latest Fedora Kernel - not - mow kernel. Screen runs fine for all users except ...

If I log in as root and then I su to another user and try to run screen
- it fails:

Cannot open your terminal 'dev/tty2' - please check.

Permissions on tty2 are 620. owner root group tty. It seems that when I su my device ownerships are not changing.

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