See Joe's JWM page:
The last change was two days ago, described as:
Fix issues with dragging windows to new desktops and fix a fullscreen problem.
I have uploaded a PET (74KB):
Comments:Posted on 28 Sep 2011, 15:25 by lobster
Healing and Well Being
running 505 in Slacko beta5
on command line after restarting JWM to make sure you have latest. Seems OK
Posted on 2 Feb 2012, 19:39 by darkcity
Thanks so much for this PET, firefox 7 fullscreen bug was driving me crazy.
works using puppy 5.28