dynamic title using calculation group

Hi, BenCardineau -
Are you trying to use a Measure to define the Title Text?  If so, when you define the text string measure, you need to exclude it from your Calculation Group rules.  I think you need to add a ISSELECTEDMEASURE() condition to your calculation groups so it focus on the Metric Measures only, and ignores String Measures.

For example:
Metric Measure = SUM ( [Amount] )
Text Measure = IF ( SELECTEDVALUE ( [Project Type] , "Hours" ) = "Dollar" , "Project $", "Project Hours")

In the calculation group expression, the following is required.
IF ( NOT( ISSELECTEDMEASURE( [Mertric Measure] ) ), SELECTEDMEASURE() , IF ( SELECTEDVALUE ( [Project Type] , "Hours" ) , Use Dollars , Use Hours ) )

In the Expression Format, the following is added.

IF ( NOT( ISSELECTEDMEASURE( [Mertric Measure] ) ), "" , IF ( SELECTEDVALUE ( [Project Type] , "Hours" ) , Use Dollars format , Use Hours format ) )

I hope this helps you find the right solution.