Also, there are adjustments on these doors, it maybe possible that your have backed off, allowing the door base to come in contact with the bottom guide. On mime this is a Phillips screw on either edge of the door. These are hard to turn with weight on the wheels. If some one can tilt the door left or right as needed you should be able to adjust for more clearance.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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