Homestead/PHP Update Breaks XDebug? dd() Not Executing

I've had a working dev environment using Vagrant / Homestead 2.1.0 / PHPStorm / XDebug for months.

Recently I (inadvertently) applied updates to the ubuntu server for the Homestead box.

This upgraded the PHP version in use to 7.1.12.

That in turn required the xdebug version to be upgraded to xdebug-2.6.0alpha1.

With all that happening, I also upgraded the Homestead box to its latest iteration 5.0.1

Now xdebug is not functioning correctly anymore at all.

PHPStorm verifies the xdebug installation, and it shows up in the output from phpinfo(), but any dd() instruction is not executed, nor is xdebug_break().

Anyone had any similar experiences recently? Anyone have any idea on how to correct this?

I'm at my wits end and am thinking the only thing which is going to work is building a new box with an older version of Homestead. :(