I upgraded "nautilus-actions" today and now, when I log-in as any user including root, multiple file manager windows - task bar icons, actually - open up as if it's caught in a loop.
Going from memory (and what's in the repository now), I think I made the upgrade from 3.0.7-1 to 3.1.0-1.
Confirm exact same symptoms on two of my machines!
Ok, I put 3.0.7 back in repos.
Thanks!