Question: Creating a library

Hi, I stored the closed-form symbolic result of a long computation in a library. When I try to substitute numerical values into the functions I saved, subs (applyrule, etc.) do not make the substitution. Looking at the operand that I think should substitute ('Ip' as stored), it is not evalb equal to 'Ip' (as typed into evalb). It appears that Maple thinks I have two different symbols with the same name. Can anyone explain this behavior to me? Thanks, Art
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