Note on page 12 of the operators manual it warns to not tighten the Bevel Adjustment Knob too tight or it may cause a malfunction of the locking mechanism of the bevel angle. I thought I had broken my brand new machine ( hadn't even cut a board yet ) until I read the October 18 post above which said to move the head of the miter saw slightly - and that solved the problem. Thank you and Thank God for the internet! Saved me a trip to the Factory Service Center. Now to go study the damned manual more thoroughly before I really do break it!