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.