Fail do log in the 3rd char in same machine

anyone got the same problem?
i have input 4 code in my SE acc and show it correctly in acc info
however , no mater i try to use normal log in or isboxer
iam fail to log the 3rd char (after log in the password just show nothing )

is that SE locked each machine only allow 2 char to log in?
or we need to do something to box more than 2 char?

my comp
I7 3930K
X79 board
DDR3 24G ram
MSI 570

OS:Window 7 ultimate (64)

thx a lot

[MiRai]

Update ISBoxer -- Help Menu > About > Download Update -- And then re-export.

strange....
still fail after setting a new set up for isboxer...
i found that FF14 already in game list after set up
however ,still fail to run 3rd char after log in ( can open the log in screen but no respond after log in ..screen disappear and nothing..)

also try to make 3 copy of game and use the 3rd copy of game for log in ...but fail too

is that any window setting will block the 3rd window pop?...

may need to try Vista for box if still fail....

Finally Solve the problem

here is the run down

1 open isboxerfirst (not inner circle)
2 update to the latest one (important!)
3 use quick wizard to set up your FF14 box key
4 export the set up to inner circle
5 open the inner circle again and u can open your 3rd and 4rd char now !

PS: thx for reply and get my box armies finally