Hello.
I have russian localization of windows 8.1(wich comes with my notebook), so visual studio 2015 installed with russian language pack too. But i prefer to use english, so i went to options->environment->international_settings and download and install english
pack.
After it i have common issue, when it is impossible to create new project: after press "OK" button in new project window its just disappear for a moment and appear again, and nothing have happen. When i change language back to russian its work fine.
I have used /log and have two log files for En and Ru language settings, but i am not an expert to read and understand them, except that En version(that one is doesn't create projects) have many warnings like:
Performance warning: String load failed. Pkg:{7D4626A3-18C3-43A4-A66C-169D1D609803} LANG:0409 ID:1141

Ru version haven't this.