sorry for delay in replying.
thank you for your answer.
i forgot to mention that i already had installed GN v1.0.2
anyway, this morning i opened again that staging site, i upgraded gantry to v5.5.1 (released a few hours ago) and it is working fine now.
honestly, i can’t say if thanks to latest gantry version or other actions i did 6 days ago after my original post (as i said, it’s just a testing site i don’t care much about…).
thank you again for the quick reply.