Help with solve()

[AngryNapkin]

This is truly driving me nuts.
I am simply trying to use solve() inside a program.

Here is a simple example.
EXPORT EXAMPLE()
LOCAL TMP;
LOCAL A,B,C;
A:=2000.0;
B:=1.0;
C:=0.0;
TMP:=solve((C/(π*B/12.0))-A,C);
MSGBOX("RESULT = " + TMP);
END;

If I create these variables on the home page, solve returns a result as expected. If I run this program, solve() returns an empty list {}.

What is going on? Is this a bug?