Thank you for asking here! For your issue, though Maximum Security is compatible with Android OS (Android OS 2.3 and above), we don't officially support modified Android OS. Here are the details of Nook HD+'s OS information.- Android 4.0.3 with customized Nook User Interface - Unofficial Android versions without Nook (e.g. User Interface) software: Android 4.3 Jelly Bean and Android 4.4.4 Kit Kat
However, if you would like to share the debug logs for our developers to the further investigation, we would be happy to receive the logs and investigate this issue. Here's a reference doc for the steps: Generating logs for Mobile Security for Android - refer to "Generating Logs From In-App"
Please provide log collection time and the Diagnostic log token number for us!