Phantasy Star Portable 2

[lumune]

(02-18-2015 12:00 AM)Steel Titanium Wrote:  Every time I make a party in game, one player manages to join while the other one leaves, and if I start, they both get stuck in the party menu, or one of them crashes.

I'm suspecting your friend has given his emulator config to the other player and thus they're conflicting because of even MAC adresses.
Ask for them to click a few times on "Change MAC adress" inside PPSSPP "Network" settings and then it should work. Also make sure that only the Party Leader has the "built-in PRO Ad hoc server" enabled, all other players must have this option disabled.

If it still doesn't work, ask the guest players to wait inside the Multiplayer screen doing nothing (0:30 in the video below), then you'll enter and select "Form a party" but don't begin party play with just yourself, wait for them to find your party and then finally click to begin party play when they're all present. It may hang sometimes, if it still fails then change the player that is the Party Leader (the one who forms the party) or change your VPN software, i'd recommend Evolve. As a rule of thumb, all players must use the latest version of PPSSPP provided by orphis to avoid version compatibility issues.