Is Catlog or Matlog stuck in loading like this when you try to load file? I figured it out it was caused by crappy build-in Superuser that was bad written by chinese.
Only way to fix is to switch to SuperSU 2.79 or use Memu emulator. Unfortunately, Nox Player already blocked SuperSU from replacing Superuser
Download SuperSU 2.79:
APK is signed to avoid update from Play Store. v2.82 does not have ability to replace Superuser
Download SuperSU apk
Dropbox - SuperSU v2.79.apk
Launch SuperSU and choose Expert. It will ask you if you want to update binary. Click Continue
Then click Normal
Allow superuser access if asked. Wait for few seconds. If it success, reboot
Tada! No more stuck in loading and no more toast spamming