Sad I had to report an issue (still actual with avast v. 6.0.1270) between Avast Pro SafeZone and Outpost Pro 7.5.1 FW. The Sandbox and OP FW is also messy (pop-ups it isn't going to memorize). You either use the FW or abandon the SafeZone and sandbox features of Avast Pro, which is a shame.
(Yes, I tried uninstalling AVAST in safe mode with the Avast uninstall utility, doing a clean install, but as reported in the few threads in OP users forum, the only way to make SafeZone work would be to disable the OP FW-and at this point, I think SafeZone is not worth it!-.)