I had an add on in mast furling system on a previous, non Bavaria boat, so this might not be relevant. On that boat the furling worked well until the end of the season when I removed the sail for the over winter period. In the spring I refitted the sail, but made the mistake of using a bowline to tie the top end of the sail to the halyard. This took up too much space such that while the halyard was tight, the knot having reached the sheave at the top of the mast, the front end of the sail itself was not tight. (can never remember what the different parts of the sail are called). The result was that the sail started to wrinkle when being furled and consequently it jammed. Once freed off I changed the bowline to a sheet bend which took up less space, and that made all the difference to the tension on that end of the sail. Hope you get the problem sorted!!