The current release of Foliobook has several major problems on iOS8.
Our update to fix these problems is in Apple’s review queue, but it has not been approved yet and iOS8 is due for release on September 17th.
Please do not install iOS8 if Foliobook is an important app for you. The update to Foliobook 3.7.3 fixes major problems but will only be available once it is approved by Apple in a few days time.
Please contact us at email@example.com if you have further questions.