RESOLVED:
The Syntax Error at token "," was pointing to a formatting statement in a form element:
SUM Liability.Amount,$#,##0
This was working fine under 5.9 but seems not to work under 6.0. Once I opened the report and tried to save these values, I got an error. So something must have changed here.
Support: Is the syntax correct but is not being parsed correctly under 6.0, or is a different syntax required to format the element?

