We have a shower which is in very good condition. Had it regrouted recently too but the screen/door doesn't fully close. It swivels freely/smoothly on 2 hinges (top & bottom) as per photo but only until it gets to about 1cm from being fully shut. I have tightened all screws, sprayed it with silicone spray, checked the alignment (all spot on & hasn't sagged), etc.
Do you perhaps know what would cause it to be reluctant to close? You can pull it all the way closed but it just pops open to about 1cm again.
