I suggest stopping a stitch or two before you get to your dot. This will allow the space the fold takes up. Just like a scant 1/4" inpiecing - which allows for the fold. Also make sure you are maintaining a consistent stitch width down to your dot or end. I believe most problems occur when the stitch width wavers as it gets to the end.
Also when you fold to begin the next corner, put the needle in just inside the fold. This will hold all layers together while you straighten the binding for the next side. Also make sure your stitch width begins the same as the other side.Most problems occur when you don't maintain seam consistency at the corner.