We have PVC windows that open inwards 2 ways -from the top and from the side ( tilt and turn ). Somehow we have managed to open the window from the side when it was already open tilting inwards from the top !!
And now it won't close as it seems jammed and the window won't tilt back so we can lock it in place.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix windows and doors.