Fox2x memo fields are union incompatible in VFP8. The following code works in VFP7 but generates an error in VFP8:

Close Databases
Set Safety Off
Create Table Test (MemoFld m)
Insert Into Test (MemoFld) Values ('Some Text')

* This line works
Select * From Test Union All Select * From Test

Select Test
Copy To Test2x Fox2x

* This line generate a "Selects are not Union Compatible" error
Select * From Test2x Union All Select * From Test2x