Foxfi Bluetooth apps won't connect

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http://forums.androidcentral.com – Been experimenting with tethering my Nexus 7 to my Razr MAXX via Bluetooth using PDANet Tablet on the Nexus and PDANet/Foxfi on the phone. While it works for general browsing, I noticed some apps can't connect (Reddit client BaconReader for example, also HBO GO sometimes among a couple others ) at all claiming there is no network available. Is there a reason for this, or a fix? In WiFi mode I have no issues and that's fine for the time being but it's nice to have a backup connection available in case WiFi mode stops working (like if my phone goes Jellybean for example) (HowTos)