Running debugging (F5), I see:
The "xsp4" web server cannot be started. Please ensure that it is installed.
Problem is it's seeking xsp4 on:
On the other hand, running Start Without Debugging (CTRL+F5) it works fine.
It's running: /usr/bin/xsp4
I'm using openSUSE Tumbleweed and I consider it inconsistent which binary is used.
You can probably work around it temporarily by creating symbolic link. Like this:
ln -sf /usr/bin/xsp4 /usr/lib/mono/4.5/xsp4.exe
Obviously I did the symlink, however I'm wondering where's problem?