Several people are reporting that the newly updated Hulu and HBO apps are not working on rooted 2nd-generation Fire TVs. Whatever the issue is, it seems to only be affecting that Fire TV model, since rooted 1st-generation Fire TVs and Fire TV Sticks seem to work fine with the new apps. Rbox is aware of the issue and is working on a fix, but needs people willing to test a potentially dangerous fix.
Rbox has a theory on why both Hulu and HBO are not working on Fire TV 2s running his pre-rooted ROM. He hasn’t tested the fix yet because it has a chance of bricking the device. Bricking his own Fire TV 2 would be pretty bad for everyone because he wouldn’t be able to work on the issue further, and worse, he wouldn’t be able to release future pre-rooted ROMs for the device until he somehow replaced the bricked device with another rooted Fire TV 2.
This is why Rbox is asking for volunteers who are willing to potentially brick their device in order to help the community. If you are willing to help, and preferably rooted your Fire TV 2 using the A-to-A cable method, you should reply to Rbox’s post or PM him directly.
For the rest of you dealing with this issue, you can disable automatic updates on your Fire TV 2 and sideload an older version of the Hulu or HBO app. Several people have confirmed that the older apps don’t seem to be affected by this issue.