BPC 7.5 MS Drill Down works on one dimension in rows but not the other

Good day,

Working in BPC 7.5 MS.  I have a piped report with 3 dimensions in rows.  Members in the first dimension are hard-coded in the expand range.  The second dimension is a combination of SELF and DEP members.  The third is set to SELF.  In our original AppSet, I can double-click drill down on both the second and third dimensions without issue.

I've re-created this report in a new AppSet (same BPC version).  All settings are essentially identical (I've double and triple checked).  The drill down works on the second dimension, but not the third.  I've run out of places to look to find the problem.  Any thoughts?

Thanks in advance.

Kim