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WaterCAD age calculation fails

I have run into a recent problem.  I've been trying to do a age calculation on our water system and for some reason the largest duration I can calculate is 128 hrs.  If I change it to 129 hrs the calculation fails and I get an error:

Calculation Engine Failed.  Please see user notifications for possible causes.

To obtain a complete list of problems choose 'Analysis|Validate'.

The user notifications indicate:

41110    "Age-128 HR"    "Scenario"    "12518"    "Age-128 HR"    (N/A)    "Cannot solve network hydraulic equations."    Pressure Engine

Element ID: 12518 is my Age scenario. 

running Validate gives me no errors.

I'm confused as to why I can run my analysis for 128hr and nothing greater than that.

Thanks