another issue or perhaps just need some clarification on some behavior - check this LVD case file. If you compute a Jacobian you'll see values upwards of 8x10^5 but if you go into the Initial State and set the initial UT to 0, when you recompute the Jacobian you'll see the values are now properly scaled to less than 1 While you have this file open, check the Dynamic Pressure output from the GA. This is what it looks like for me: The double hump is back and it not being smooth on t