Enable Non-Market Apps on Sony GTV
"Although the information we release has been verified and shown to work to the best our knowledge, we cant be held accountable for bricked devices or roots gone wrong."
In 3.2 Sony removed the ability to install apps from non-marketplace sources. You can still install via ADB, but not via dropbox, chrome etc.
To fix, on a rooted box, connect via adb, and fire up a shell (adb shell), then:
/bin/busybox sh /bin/busybox sed -ir "s/install_non_market_apps0/install_non_market_apps1/" /data/data/com.android.providers.settings/databases/settings.db reboot
Done, you can now install apps from chrome, dropbox, etc!