We're aware that some users are experiencing the issue that they don't receive the notification of new chapter in Favorite tab while using Manga Rock 4.3 & above.
This is a confirmed bug from our Devs and it will be fixed in the upcoming hot fix.
We truly apologize for this inconvenience caused and thank you for your understanding.
Affected version: version 4.3 & above running iOS 10.3 and above
First reported date: Jun 4th, 2018
Resolved date: Jun 7th, 2018