I have found that when programitically getting the calculated value out of some formula cells, grid(row, col).FormulaTag.Text returns a blank value. But if I get FormattedText first then get FormulaTag.Text it returns the calculated value.
We recently upgraded an application we have been using in production for 10 months from 184.108.40.206 to 220.127.116.11 and this did not happen before upgrading.
Other Info: After first filling the grid with formulas and data, we call functions to activate all formulas immediately using:
Dim engine As GridFormulaEngine
engine = CType(grdMain.CellModels("FormulaCell"), GridFormulaCellModel).Engine
engine.UsesVirtualDataSource = True
Maybe this will be helpful to anyone else running into this problem.