Hopefully you've got this resolved. I ran into similar issue in the past. In my scenario, the problem was due to DHCP snooping. With DHCP snooping, you'll want to make sure all paths towards DHCP server are in trusted segment. There's also a glob...
I know this is an old post but didn't see someone has answered it. To remove a logical interface, type in "no interface gig0/1.1" as you have noted above. I think the problem why it may not work for you is because you may have typed that command wh...