A few suggestions that work
SMC.We had a 2001 Beneteau 361 and we now have a brand new 2006 Beneteau 473. Both had/have in-mast furling main. The 361 was the first in-mast furling main we had, prior to that we had the classic/standard main. My wife does all of the hoisting and trimming of the sails and occasionally experienced the same symtoms on our 361 but they were random. We checked around and this site gave some very helpful advice that we tried and it did the trick.The major reason for the sticking or hard effort to unfurl is because it (the main) more than likely was not furled properly. By that I mean when your furl the main, make sure you are into wind and when you start to furl keep a some tension on the lazy main sheet so that the main is furling nice and evenly and tightly. The more it flaps and flys loosely the more uneven and looser it wraps and therefore causing it to rollup inside the furler with creases and jamming. Keeping tension on the lazy main sheet is very key to a nice even tightly furled main. This effort is rewarded by a nice easy (non sticky), even flowing unfurling. The other helpful hint is prior to unfurling, ease out the main sheet slightly, therefore raising the boom about 5 to 10 degrees above parallel to the deck. This gives less stress when outhauling and helps it slide along the track easier.These two things we learned a few years ago and we have never had a problem since. It is also advised to keep the blocks/sheaves and tracks lubricated maybe once a month or so. After you've done this for a while you'll say, boy this is just common sense, but as they say "who knew?"You will love the in-mast furling, it makes sailing even more enjoyable.Hope this helps.Rich