You have a typo here. Each line (except the last one) in the JSON format has to end with "," ... the lines after

"thread-concurrency" : "8192"

are not parsed in your case because this line doesn't end with "," ... add comma to the end

"thread-concurrency" : "8192",

and try again.

You can also start cgminer with the --text-only option and also with the --verbose option ... this way you'll be able to see which part of config file wasn't properly loaded.

cgminer --text-only --verbose ... other parameters