UnicodeDecodeError

I am using the Windows version 0.11. Previously there was no problem, but after installing the new version I am unable to run it with UnicodeDecodeError error. I tried to remove the configuration file, but with no luck (by the way, were is the configuration file stored in Win). Direct uninstalling of 0.11 version and installing 0.10.1 version works, so I am stuck with the older version. I also tried the version with/without GTK.