Signature Info and Entry functions

I was trying to make a DXL attribute that displays the Signatures of a baseline, and this function is returning "false" for all my signatures..

bool getIsValid(SignatureEntry sigentry)

>> FROM Help file:

Returns a boolean value indicating whether the signature hash is still valid for the stored signature entry. This might be used to verify the integrity of signature data.

Is there something wrong with our server setup? or with this function?