This is called hovering (like a helicopter does). I have noticed
some variability in this feature.
First, I *think* the code  has to be run then halted for hovering to
work -- because values have to be assigned to be visable -- I could be
wrong.
In Excel 97, which I use, I don't think I see values upon a hover
except in the procedure where the break occured. Are you outside the
procedure in which the code was halted?
I also think that if I do an actual select in another procedure, it
won't display upon a hover in the original sub.
I also notice that (sometimes) I can see a value while hovering in
the immediate window.
I haven't examined these behaviors carefully to see it it is an
operator thing or VBA or the phase of the moon.