Try saving JSON out the Dictionary object and inspecting the result. It uses its own slightly different format. Make your JSON in the same format and it should load just fine.
I did think of that. I get the below "Syntax Error."
Let me know if i'm missing something.
I used:
{"c2dictionary":true,"data":{"5":1}}
And:
"{"c2dictionary":true,"data":{"5":1}}"
<img src="http://i.imgur.com/7uewS.png" border="0" />