XnView Software

For some reason xnviewmp (ver 0.79 on mac osx 10.8.5) stopped letting me resize the free standing preview window.
I resarted xnviewmp but still same problem.
is there a startup config file I can change/delete?

Help> About
Shows where the .ini file is located. You will lose your settings when/if you delete this. Maybe try to change your layout first.