the latest forge version 10.13.0.1191 broke magnatizers
1.7.10-10.13.0.1190 works.
https://www.youtube.com/watch?v=rFCqDtdw6VU&feature
not sure what changed but i put a report in IC2 bug tracker at least
http://bt.industrial-craft.net/view.php?id=1196