I did this in the command window in 6:

x = ".T."
? EVAL(x)

Gave me .T. with no error.

Are you doing something that involves all the records? Is it possible one of the records has something screwy in it?

>It is a character expression that has a condition that evaluates to T/F.
>
>".T."
>".F."
>"HepBStatus(id) = 4"