Note to Self - USGS Documents have Version Numbers
Anyway, I noticed that something was wrong when trying to import an existing SFR2 input file into Groundwater Vistas and the format did not match the manual I was working from. This problem would also affect files created by Groundwater Vistas for SFR2 (SFR1 would not be affected and this is the default setting in GV). However, the created files would not run so if your model was affected by this problem you would know it.
Version 5.17 Build 5 fixes this problem in SFR2.