It seems that this problem only existed on older iOS (before iOS 4.2). Therefore, it is recommended that for best performance, you should update your device to the latest iOS’s (either 4.2 or 4.3).
One other point, whenever you need help with the app, please send us an email either from the in-app support button, or from our website. We can’t do much for your when you ask for help by writing a review on iTunes, because we do not know who you are nor your contact. You can find the in-app support button below:
Thanks, and have an awesome weekend! Don’t forget to tell the world how much you love #MangaRock!