Chrome won't properly install to /system/app

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http://forum.xda-developers.com – Bought a new nexus 7 yesterday (after having my old one stolen...) and I decided to root and install AOKP JB MR1 Milestone 1. I'm really impressed with it but I was surprised to find the AOSP browser rather than Chrome and a lack of Performance Control. I tried to install Chrome as a system app (download from Play, push from /data/app to /system/app and set permissions to rw-r--r--) and rebooted. I was again surprised when I found that "Chrome's installation was incomplete." It worked fine in /data/app but I am now curious as to why it won't work in /system/app. (Sorry if this sou (HowTos)