The photos do not show the gap or the sunlight coming through but they do show the plastic part on the left that accepts the hook from the roof is higher than the one on the right. As a result, the roof on the left side doesn't meet the frame snugly. If I can take pictures that better evidence what I'm trying to describe I'll post them tonight.
Left side:
Right side:
Bitter, thanks, I found that site last night and searched back to 2003 without success to see if a similar question had been posed. I'll give it a try here before I try over there.