I can't change the Parent of a Device Group after it has been created. I tried to edit the Device Group, then changing its Parent and finally aplying Save to it. Doesn't work!
Just for the record I am using NetMRG v0.16.
Thanks for your attention.
I see you started bug#267
for this. We'll try to get it fixed for the next release.
The bug should be resolved; if you want to try the fix, the only file you need is groups.php; you can get it from tonight's cvs snapshot, or directly from CVS.