I have sliding doors for a wardrobe, and i replaced the roller-wheels. Now they stick at the top, its as if they are too close together. I replaced the wheels in the same spot on the door, but they are slightly different brackets for the wheels, so I'm not sure if its just a matter of me trying to find the "sweet spot" to screw the wheel-bracket, or if its something else I should be looking at.
Thanks for everyone that asked questions. There were a few things I had to change to finally get it working. I had just bought the house and I assumed that the previous owner had the door's rollers fitted properly, basically I had to:
Once all of these factors were fixed the door finally worked!