I found a bug from your app, 'comicglass'. Please check out the PDF file I'm giving you that you can down from blow URL. It consist two pages contents as one page.
1. Open PDF file.
2. 'Display double-page' and 'Creage a split page' are on.
3. Rotate your iPad or iPhone to landscape mode to see two pages at the same time.
4. Do Page over forward. It's not odd.
5. Do page backward and then empty page comes out. (that's the bug.)

http://dosman95.iptime.org:8000/ajp/public/4ee66ab4379c954c2a2866b9b53b6833.php

I found that bug from on iOS 6.1, iPhone 5, iPhone4, iPad3.

The app's version is the latest one. (the earlier version is also.)

Thank you for the variable bug report
.

I will check using the file which I had sent.
I will let you know when I find it out.

Thank you.