This article explains why you may experience difficulties with loading manga from external sources.
For the past few months, many popular manga sites such as Manga Fox, KissManga, etc. have tried to block many manga reader apps from accessing their site. We have been working very hard to work around this issue, but it is going to be a constant process, as those sites will definitely try other methods to prevent us further.
That will mean you may experience pages not loading/ downloading properly. As of right now, the app does not have a way to inform our users that it fails to download certain chapters. So it makes our users believe that the chapter is downloaded successfully.
While waiting for us to improve the way our app handles downloading, we strongly encourage that you check out our official Manga Rock Source.
With that being said, please check out Manga Rock Source and let us know what you think. Thank you!