Recently a bug has appeared in Openpli 4.0 whereby the box will not restart enigma2 nor will it reboot from the remote.All it does when you try is to give the constant spinner and this continues forever.
This doesn't happen all the time and there is no telling when it will occur,you can go a few days without it happening and then it can happen twice in a row.
This is not just my setup as Ive spoken to others who also have this bug,all are using VU+ boxes though,so I cant speak for other boxes.
The only solution when this happens is to telnet into the box and issue the killall enigma2 command or the reboot command.This is most annoying if at that time the PC is not switched on.
Please look into this.
As I said I know of at least 4 other people who have experienced this on VU+ boxes.
Ian.