I was also facing similar type of issues but it is resolved after changing the
default dnx version.
I was not sure about command to change the defalt dnx so I re-installed x86 and I noticed that the dnx version which is installed at last become the default dnx version.
To reinstall it use following command
dnvm install 1.0.0.-rc1-update1 -arch x86
Before installation of x86

after installing x86

if this is not you case or it does not resolve your issue. you can remove all your existing dnx version and reinstall the dnx for version "1.0.0.-rc1-update1" or latest available version.
Added
to change the DNX runtime Version use the following command
dnvm use <DNX Version> -r <Runtime> -arch <Architecture>
e.g. dnvm use 1.0.0-rc1-update1 -r coreclr -arch x64
and to see the current version use
dnx --version
But this is not persistent it will apply to the current session only if you want to make your changes persistent then use the below command.
dnvm use 1.0.0-rc1-update1 -r coreclr -arch x64 -p