Thanks for the help everyone. Come to find out that when you try and do
an Include:=xlErrorBarIncludeBoth or Include:=xlBoth (which is the same
thing as far as I can see) with the Type:=xlCustom you must include
both the Amount:= (for the positive directions) and the MinusValues:=
(for the negative directions) even if you want to use the same values
for both the plus and minus of the error bars. So that was what I was
leaving out. Thanks again.