Symptoms

Using the 'Contains' operator in an Advanced Filter causes XML errors when loading a form.

I.E. VIEW CONTROL] contains VALUE]

Using the "Equals" operator works.
 

Diagnoses

Currently the contains filter can only be used with a SmartObject field on the left side.
This is actually a core SMO filtering issue and you will get the same error if you built the equivalent ADO query WHERE ‘asdas’ like ‘%asdasd%’
 

Resolution

This issue has been reproduced, logged, and is being investigated for 4.6.12.