They could all be different but my sliding cupboard doors have to go back top first and there seems to be quite a bit of height for the door to go in and then drop down onto the bottom run.
**Just wants to pass some time without any hassle**
Thanks for that. I've discovered it had been damaged & that's why I've been battling with it. It's far gone now, I'll have to get it replaced, hopefully it wont' be too expensive.