I fund the problem but it is not easy to explain. If you provide me with your email address, I will take a photo and send it to you.
Suat
April 2015
Well nobody here can see the obstruction that's causing your top tray to get stuck - but you should be able to see it.
Take the tray off the runners and try each runner in turn without the tray fitted - if the runners work without binding then you may have an issue with the tray itself.
This is a problem that requires careful observation leading to a conclusion and resolution - this is the way to get it fixed.
Good luck with the looking & thinking...
April 2015
I can answer this question...
how can i fix AEG 40860 dishwasher top tray gets stuck?