Thanks for this brilliant piece of software. So far I've only noticed two issues using Xprivacy. I'm on stock rooted Galaxy S3 GT-I9300 4.1.2 kernel. Using latest Xposed and Xprivacy 0.12, patched with the CM patch.
1. In Google Play Store 4.1.10, when going to 'my apps', scrolling is very sluggish, and updating the apps from there manually makes the store app almost completely unresponsive, to the extent that progress bars will appear stuck and the interface becomes exceedingly slow. It appears Xprivacy is flooding the logs at this point. This makes the update process difficult to use. Xprivacy also appears to wait for you to review the app settings before proceeding to the next update, irrespective of whether the app has preferences set already.
2. This may affect other apps requesting location data, but I've noticed it in Facebook. It requests a GPS fix, and once that is available it'll keep cycling through random locations really fast, about one or two every second. Is that normal behaviour?