Posted by Gordon on Sunday, April 21, 2002 at 4:32AM :
In Reply to: Door window installation posted by Joel F on Saturday, April 20, 2002 at 1:00PM :
It's worth remembering that the lower run channel is handed - get the wrong side and it'll fall off the rollers when half way up.
If everything else works try swapping the sides of the lower channels.
Gordon