Quickfix does not open after a failed :Make

[tankorsmash]

Somewhat similar to #169 except I'm on Windows10. I saw that it needs to have a matching errorformat, but that seems like its not a problem given that :Copen correctly shows the errors if I wait after the cmd.exe window exits.

I'm using msbuild for VS2013's C++, and vim -9log doesn't have any errors in it. I've tried it with GVim 8.0.589 and the console version. Disabled nearly all plugins except a colorscheme one and I wasn't able to get the quickfix window to open after :Make, despite there being an error correctly shown in :Copen after a second.

I'd be happy to provide some more information if there's something else I can add.