I was out on Lake St. Claire today and the wind gusts were reaching 20 Knots and up. I came upon a 28 foot sailboat in distress with their roller furling line jammed and not able to retract it. They pulled in our marina with the sail in shreds under power. I've had mine jammed several times but was able to go forward and unjam it. Since then I was told to move the block feeding the line along the deck aft so as not to pull down on reel of line. Also, I tie off the line at the cockpit when under sail so it doesn't slacken and get jammed. It seemed simple but how many sailors foul up their roller furling when dousing the sail and get in a similiar jam. It sure ruined these sailors afternoon. They were American and ended up at our canadian marina luckily able to tie up at our gas dock. They had to unfurl their wrapped genoa under a strong wind before being able to take it down lowering the halyard. Their lines were shredded and even though they hoped to have their genoa sewn it looked to be a write off to me. Anyone have similiar problems with their furling system and any advise? Thanks.