I’ve downloaded the newest version and when I try to buy bitcoins, a message tell me that I need to add first an arbitrator but is no one 
My bisq platform is 100% sync
Weird. Have you try restarting the app? Do you see anything suspicious in the Network info tab?
Maybe send Manfred the log file would be a good idea.
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Yes, restarting… works 
Thank you
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Probably you did not received the data from the seed nodes (right lower onion icon greyed out). The tor network is under heavy load (or attack) since a few months and that makes network connections in Bisq slower and less reliable.