I was only trying to move one at a time and it even did it after I removed all of the lights. When I put the first one back in and tried to move it into the right spot the editor crashed, locked up and took a crap on the floor, (and this isn't your Ranch map, so far it's working great). There is at least one very complex brush in there that seem to have a lot of overlaps where the brushes weren't lined up too well before the T3D was made.

I'm just under the strong impression that since it happens with just 1 light that it's probably a misalignment of brushes.