In mast furling
If you are asking about installing the sail on the furling tube in the first place, no, I haven't had any problems. If you are asking about setting or furling the sail, here are some thoughts that apply to the Charleston Spar mast that I have. The only time I've had trouble setting the sail is when I had too much vang or mainsheet on, pulling the boom down. The resulting angle between the mast and boom was too wide for the leach of the sail, so it wouldn't roll out. Also, while the sail will furl or set in just about any boom possition (port or starboard), because of the direction the furler turns and the slot in the main, it's better if the boom is centered or a bit to port. Other than these operator errors, I've had no problems.