MonoGame 3.7.1, with Windows 10 x64.
Trying to build my .mgcb file, but the Build and Rebuild commands do nothing and provide no output.
Is there a log file somewhere that might contain more clues?
Where are you running it?
In VS2017 you can go to options->MSBUild and turn on diagnose output (or something like that) and it will print out more detailed information in the output window - maybe it helps