Dont know if this is on topic, I have 5xlancelots, But 2 of them are not recognized by the computer?
I was having a bit of a similar problem. On the command line, when I started cgminer, I was using -S com9 -S com10 and so on. The one on com9 would work but the other com ports above that wouldn't. Then I read the README file said to do it like this under Windows: -S \\.\COMnn