Hi, thanks for help, here is the story:
I've got the SD corrupted, I bought a new one and I cloned there an old SD image I did last months. Node red 0,20 was working with the old flow. Then I start upgrade raspbian, node.js and node red too, cleared mpm cache, but when I've started it the flow was blank. Then I've upgrade all modules, I stopped NR, overwritten the flows_raspberrypi.json with the latest/backupped one (NR versione 1.06) and again it is blank. Where am I wrong?