Unable to debug azure function dotnet core project when windows user name contains spaces

I have just updated to version 15.0.31201.0 of Azure Functions and Web Jobs Tools.

I can create a new azure function project (dotnet core) with an http function. However, when I try to debug from visual studio a command window opens and then closes almost immediately.

The error message displayed is:

No executable found matching command "dotnet c:\Users\David"

Note that "David" is just the first part of my Windows login name and it contains a space.