I'm sure we've all experienced it once or twice, and maybe someone else has already brought this to everyone's attention. But a few times recently I've had a hard time latching one of my saddlebag lids, so I took it off the bike to look into the problem. I thought it was going to be a problem with the latch or the catches or something of that nature.
Luckily, it was none of those things and nothing had to be replaced. It was actually a pretty simple problem. Apparently, it's pretty easy for the black, cloth tether to fold under itself and get hung up in between the lid and the bag. This causes the problem because then there's too much distance between the bag and the lid. Pretty simple... so simple, you kinda feel stupid for not realizing it earlier. Several times when this had happened, I looked at the latches, the catches, the gasket, etc. I finally realized it when I had the bag off the bike, upside down, and tried to latch it. That's when I noticed just a little bit of the cloth sticking out.
Hope this helps.