AutoCAD 2007/2008/2009 DWG Format

[#1]

I've created a formula in a table cell and it works at first but then later if I add rows or modify the table at all, the formula stops working. The formula is referencing the correct cell, but just keeps the old value. See example below

Cell F24 = 2,108
Cell F78 = 51.9*0.2*F24*0.62/0.625 = 21,705

but if I modify the table, and then change the value of F24, cell F78 does not update even though the formula has not changed. Anyone have an idea what is happening. Thks.
Peter

[#2]

Same problem in later version. Formulas in table stops working.

One way to fix this issue is to select each cells and edit field to update. But that's a pain if there's a lot of cells. I was hoping there was an easier way.

Any idias?