I have been working on this part and i rolled the part backto add a groove along the edge. i added the groove to one side andeverything was fine (Groove2), when i added a groove to the otherside of the part, everything went crazy (Groove3). due to symmetryi can get around this, but i am just curious why i get what i doand why it works on one side and not the other.

i attached the part below, its made in 2009 SP1.SolidworksParts And Features