WINDOW NOT STAYING OPEN PROBLEMS
If your window doesn't stay open properly, it's more likely the sash balancers. There are different types, block and tackle, constant force and spiral balancers.
WINDOW CLOSING PROBLEMS
Possible issues is your "meeting rail or interlock" is not linking up properly and not allowing the window to fully close. If it doesn't line up with the latches, which arent closing properly, this could also be the same issue.
DOOR CLOSING PROBLEMS
There could be several issues causing this. The main one would be the strike plates are not aligning with the lock. It could be the door is out of square and will need to be readjusted. Your window or door will need to be serviced by a professional.