Can't publish changes

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When my customer tries to publish any page we get this error:
ini_set(): A session is active. You cannot change the session module's ini settings at this time

I have searched and the only code that does a session_start is in multidomain.

How can I track down where this is happening?

Sean

Environment:
# concrete5 Version
Core Version - 5.7.5.13
Version Installed - 5.7.5.9
Database Version - 20160615000000

# concrete5 Packages
Delta Ed Spas Website Package (1.0.5), Manual Nav (2.1.1), Multiple Domains (2.3.2)