I spent whole day trying to solve this issue and finnaly I found the solution! I also have russian windows and after updating VS2012 to VS2013 my projects started to show the same error:
error : syntax error at token '{' in: {
I tried to change environment variables, but this did not help. The only thing that helped me was changing default language of non-unicode programs. You can find this setting in "Control Panel > Language and Regional Settings > Additional > Change language for applications that dont support Unicode". I changed language to english, rebooted ... and profit!