ΣLIST, ΠLIST and ΔLIST with vectors [SOLVED]

[DrD]

Do you have examples that don't work?

These vectors seem to work ok:
M1:=[1 2 3 4];
M2:=2*M1;

ΣLIST({M1,M2}); ==> [3,6,9,12]
ΠLIST({M1,transpose(M2)}); ==> [60]
ΔLIST({M1,M2}); ==> {[1 2 3 4]}