picomiles

sorry @ipstenu,

I hadn’t understood immediately your suggestion so my previous answer was a bit wrong; as I said, BuddyPress plugin and X2 theme were the same on both sites but not all the plugins installed were the same, they were different.

So, thinking about your suggestion, I deactivated almost all the plugins on multisite till I individuated a couple of plugins (strictly interconnected between them) causing the undesidered behavior. So, after a boring but deep test, I deactivated them definitely to solve the issue.

I have to report, however, these plugins were both present and active on multisite and monosite but in the latter they don’t cause any issue, so they are still present and active on monosite where _blank behavior is as expected despite their presence.

Thank so much for your help 🙂

Nino