David,

Like Bill mentioned, that style door with that type of slide will probably bind if not opened carefully.

The dowel pins may cause some of the problem, but most of the time it’s simply because the door can rack and the door itself will bind in the opening. Both sides of the door has to remain parallel when being pushed back in the opening or it will bind.

Round everything as much as possible and wax the edge of the door along with the pins and track.

Good luck.

John @The Hufford Furniture Group