There's no reason it shouldn't be working on 13.3.1, unless I just happen to be very lucky. Check back in the security settings to make sure that the launcher has full access to everything. To do this, open System Settings > Privacy & Security > Files and Folders, then select "Launch CoH". Make sure that the toggles are switched on for the three selections (Desktop Folder, Documents Folder, Downloads Folder). Also, do you have any firewall software installed? If so, there's a chance that could be interfering with the launcher as well.