Oh, and if you have Sileo/Zebra, these will also cause vnodebypass to fail sometimes.
You can fix this by adding them to the hiding list.
The hiding list is located at /usr/share/vnodebypass/hidePathList.plist
Then add these paths to the list:
/Applications/Sileo.app
/Applications/Zebra.app
If you don't have Sileo or Zebra, then you can ignore this post.