Applicability of the changes in configuration is broken, at least to some extent.
e.g.
Controller USB - USB2 to USB3 and vice versa,
etc.
$ rpm -q virt-manager
virt-manager-1.2.0-1.fc22.noarch
$ rpm -q virt-manager
virt-manager-1.2.0-1.fc23.noarch
However it is resolved upstream.
Tested with commit:
$ git log -1
commit b02cb7ffa04cf40d66b69cfb4c52b755b90470ed
Author: Cole Robinson <crobinso(a)redhat.com>
Date: Wed May 20 17:42:45 2015 -0400
delete: Improve dialog sizing and scrolling
Drop horizontal scrolling, since with gtk3 hidden scrollbars it might
mean users don't realize there's info that is scrolled off.
Adjust the default sizing to match that pattern
The new release will follow soon?