[john2112]

Last night I was trying to open two clients, didn't work for the longest time and then suddenly it just worked. Now after closing them and trying to reopen another two, it doesn't work. Anybody know why? I'm also on Mac.

 

[slashnhax]

Doesn't Mac reopen the current instance of a program instead of a new instance most of the time?
Here's a link that might help, but I don't have a mac so I can't really help any further, although hopefully someone else can
Launch & Run Multiple Instances of Any Application in Mac OS X | OSXDaily

 

[mahmoodz]

I am having the same issue. Can't run more than one instance on mac. Following SlashnHax suggestion, the bot seems to somehow use the OSRS client to run RS3 in it. Running multiple instances of RS3 or OSRS won't show up in the client list in Runemate.