I believe I've found an instance in which the
Office 365 Update Changes ‘Display Name’ on Required Fields
issue is causing a problem.
When using SPDisplayRelatedInfo (Sharepoint 2013, SPServices 2014.01) the DIV gets created as "SPDisplayRelatedInfo_undefined". The columnStaticName does not get appended, and "undefined" gets appended instead. Otherwise the function seems
to operate as expected.
The DIV gets named as it should if the column is updated from 'Required' to 'Optional'.