I had this problem after I upgraded from 10.10 to 11.04, but this seems to have fixed it for me:
sudo dpkg-reconfigure docky quit docky restart docky with docky & -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/758683 Title: Docky sometimes does not reappear with maximized applications -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
