Invisible signature in Adobe 8 with SDK

Hi,
I have a question about digital signatures. I´m using the SDK AddSignature method to insert a digital signature in a PDF document (first creates a blank digital signature field, second configures the signature annotation appeareance).
Sometimes, this inserted signature becomes an invisible signature.
Assuming that the coords (x,y) and the size are properly assigned, and all of the are distinct to 0 ...is there another way to cause this ??

Thanks Leonard,
I looked at the code again and I detected a case where the appearance was not properly initialized, as you suggested.
I´ve corrected it an now it is working fine.

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