Is this a bug?

[AlpGlide]

I do not know what I did yesterday, but since then there is a problem.
at home screen. I can move to different items, like Books, News etc, by flip or pan,but I can not go further, enter into Books, News etc.-- I can not read books.
I try to "Menu -- View as List", then everything works.
If I switch back to "Menu -- View as Covers" then sometime the problem comes back. sometime, there is no problem.
The equipment goes to frozen easily ---- No response to flip bar, or pan,the only thing I can do is to reset it. After reset, it has response, but still stay on home screen.
The only advanced option I enabled is : Enable folder-based access to your content. I disabled all others.
I use only "View as Cover" before yesterday. I never use "View as List" before.