Hi Thank you for this toolkit Updated to 4.11 but have skeleton compatibility issues with all my ART rigs ever since.
It is the neck02 bone causing incompatibility errors for all my characters. Even a fresh default ART rig is incompatible in a clean 4.11 project third person template default UE4 mannequin unless I avoid making a neck02 bone. Anim files are still compatible regardless of the skeleton hierarchy.Adding any other extra bones in ART still works though. For example my main character is using your face module, chains and jiggle weights. but unless I delete neck02 from the skeleton in Maya I get the compatibility errors when importing using 4.11
I have worked around it by overriding the default UE4Mannequin with a default ART rig that has neck02 bone. This makes all of my character rigs compatible with UE4Mannequin Skeleton again. animations look a bit funny though
Also my characters are changing scale based on the scale of the animated rig. In 4.10 characters retained their proportions when playing animations but now characters are shrinking when playing certain animations 
was wondering if these are bugs or has 4.11 changed how skeletal meshes and animations work? Thanks again for the toolkit!