(FFXIV) Can't open more than two instances of the client ?

[Flight]

Is this a known issue and is there any way around it ?

Can only open two instances of the client on my PC. Third gets past log in and then closes.

[MiRai]

Launching more than 2 clients requires either virtualization or multiple machines. You don't mention which software you're using, but ISBoxer takes care of the virtualization for you. I don't personally know how to get FFXIV to work with other multiboxing software.