I've same problem with Ext4, Jaunty 9.04 x64 and kernel 2.6.28-11).
Sometime, without blackout or crash, the applications on Jaunty diseappear or become not visible.
Last time I've started GParted and don't found ntfsprogs but is installed!
Sometime diseappear the icon on gnome menu of some application...
Sometime diseappear a aMule configuration files...
I've same problem with Ext4, Jaunty 9.04 x64 and kernel 2.6.28-11).
Sometime, without blackout or crash, the applications on Jaunty diseappear or become not visible.
Last time I've started GParted and don't found ntfsprogs but is installed!
Sometime diseappear the icon on gnome menu of some application...
Sometime diseappear a aMule configuration files...