Issue Navigator

I’m reorganizing my vessel with new modules and for some reason I can’t use Navigator anymore. If the sync button in checked then only two LED on the left are bright, if sync is unchecked then the four are blinking like crazy.
I haven’t done anything special just connect the sync in/out, the Navigator is in between MP and a PR (on terminate).
Is he dead ? :frowning: ?

Just found this on facebook :
Facebook Groups

this is exactly my situation.