We saw this between unix and PC and one user figured out that
label_font_id's were different. Thus older versions didn't recognize as man=
fonts as newer ones. I'm thinking this matches your description if the
binaries on the two machines are in fact different versions.
set label_font_id, 1
and the missing labels should show up.
There are other fonts... 2, 3, 4, 5, etc.?
I don't know how high they go, but I think by #5 labels will vanish in some
older versions but still display in newer ones.