Hi, Probably the best way to get deep in source code is to correct bugs! So.... In the branch: http://svn.codingteam.net/kinovea/branches/erik.larsson/bug_fixes/0000164 at revision number 197 I have added a bug fix for Magnifier-bug reported at: http://kinovea.org/bugs/view.php?id=164 Ps. I've not been able to create an account on the bug report system, hence the mail info! /Erik