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Some example files reguire extensions even when they shouldn't.
Mr. Push It example file doesn't help because she needs isometric movement. She had downloaded Sokoban file from here: http://www.andersriggelsen.dk/mmf2_examples.php
In that file the object is moved with detectors. My client looked at one of her old files where she tried it with detectors and she found one mistake there. When she fixed it she got the player object to move but she noticed that there is still something wrong with it. The player object goes under the pushable box although it should push it. She means that it doesn't work with detectors.
This is what works: