Help with this pop-up please

This keeps popping up each time I install an app and it's driving me bonkers. Has anyone seen this before or know how to track down the culprit? I can trigger it and provide a logcat if needed, just let me know what level (using catlog) of log you need.
Thanks in advance for any help.

I've been randomly freezing suspects in TiBU like my weather widget to no avail.



Sent from my Nexus 6