Its hard to fix something that isnt broken for the majority of players. I know Ive occasionally used it over multiple computers, and other use it rekgularly. So there must be something specific to your setup that is preventing the client from loading.
From reading other complaints, a lot of peeps are stating it was an addon on their browser. Specifically ADBlock.
As for my settings I dont use anti-virus, I have a fire wall what ever comes with the OSes on my computers. Those can cause issues esp anti-virus and if you have a high grade firewall as they tend to be very anal. As for my browser I use Chrome on all of my computers with adblock apng and a ruler plugin
also you can go here https://www.mibbit.com/ and click on launch client then on the next page next to the drop down select server and in the block type in irc.swcombine.com select your nick and channel and you are in that way as well