Desktop is not locking automaticaly when there is seahorse prompt for wifi password

Binary package hint: gnome-screensaver

I'm using Unity interface with new Ubuntu 11.04 (64 bit version). I've set up automatic login without password prompt and after boot I'm prompted for password to unlock seahorse (in order to login to my wifi network). I can leave computer for any time and screen is not getting blocked by gnome-screensaver. But when I fill the password and unlock seahorse, screen gets instantly blocked by screensaver.

Steps to reproduce:
1. Use autologin (however this issue may be present also without autologin - I havent' checked it) and different password for seahorse than for user login to system.
2. Boot computer with wifi turned on
3. After booting there should be prompt for password from seahorse
4. Wait
5. Screen doesn't get locked

Expected result:
Screen is locked after some timeout.