Smush Pro metadata removal and WPMUDEV dash & Site Origin Clash

Hi, this does relate to cabbe.se, but also a more general question about compatibility with SiteOrigin.

I installed Hummingbird and subsequently WPMU DEV Dashboard to perform checks for speed etc. This got rid of all of my Custom Css from Site Origin. Upon removal this was fixed. Do you have any idea why they might be clashing/any plans to make these two play nice together? Quick fixes welcome, would like to use your plugins if possible.

Secondly, does Smush Pro remove all Metadata stored in the file to make it smaller. If so does this include all Alt tags, copyright information, description, header etc ??

Thank you in advance.