Dresser drawers getting stuck
First make sure that the runners are tightly secured to the cabinet, and the screws holding the tracks on the bottom of the drawer are also tight. 

If they are, then remove one and inspect the sliding surfaces for any obstruction, and any shiny spot. A shiny spot is a rubbing spot. Rub shiny spots with 80 grit sandpaper. 

If you still have the problem, with this runner still removed, try sliding the drawer with just the other one installed. If it sticks, then remove that runner and check it out like above. 

If this has not solved the problem, check the runners and tracks for squareness. You can also measure the distance between the center of the runners, front and back, and the center of the tracks, front and back to determine if one of them needs moving slightly.