I hope this will help. First I would open it all of the way up. Clean the track, because it probably has some very still grease and that may make it hareder to close. Once clean, use some silicone spray on the track and then try it. If that doesn't fix the pobably, You may need to tighten the clutch. I don't think that is the problem because you say that you can't close it manualy. I would lubricate the track and it should help if not fix the problem. If it doesn't, post here again and we will go the next step. Good luck.