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When changing pipe diameter, with pipe annotations Length (3D) and Diameter created, results in the error "index was outside the bounds of the array."
This issue has been logged as defect report number 389818.
If "Use 3D Length?" is checked (Tools>Options>Hydraulic Model), then the pipe attribute "Length" is equal to "Length (3D)". Therefore, the annotation "Length" can be used in place of "Length (3D)".