Now that we have all tossed in our ideas, we don't really know much
about the problem. I'm not an MVP or excel expert, just a hacker ...
but here's my experience just the same;
There may be nothing wrong with the formula. One thing is that it
depends on what type of data is being concatenated. I have learned
that if the column width is not as wide as the results display, it
won't all show up. It will drop whatever won't fit from right to left
to the first space that will fit inside the column. For instance, if
I A1= Joe and B1=McGillicuddy, then the formula =CONCATENATE(A1,"
",B1,) will produce Joe McGillicuddy. But if the column isn't wide
enough to display all of that, it will display "Joe" (without the
quotes), and if you widen the column, the rest will display.
Does that make sense? It seemed easier to explain before I started
typing.
--Jim