That is a bit disheartening. I was hoping you would find a glaring problem with 4.2.2 along with an equally obvious and easy fix...

A test app might be useful for troubleshooting. Any feedback is better than none, which is what I have to work with at present.
Other than allowing the OS to install from untrusted sources, is there any other security setting that needs to be changed?
Any other thoughts on what I can try? I wish I had another Android tablet that I could borrow to test with, but I don't.
Are there any diagnostics or logs on the HX that I can look at?
Thanks,
-Dj