Multiboxing login issues

Hey
So I've been multiboxing for a while now. To log into warmane website with each of my accounts i have been using different browsers so i can stay logged on. One of the browsers i use is chromium which i launch using simple js code.
Since yesterday this method of logging in does not work anymore, i am unable to even try to solve captcha. Is this an issue anyone else has had?
And does anyone have any better method of keeping several accounts logged on than using different browsers?