Help - Digital Signature Field Issue

Hi,
I encountered some issues when designing a workflow process that needs digital signature
Intro:
1. Initiator signed on Signature field A
2. Manager reviewed the form & signed on Signature field B
Issue 1:
The initiator signed the form on Signature field A, and then the signature icon (a pen with questionmark "?") appears on top of signature. From the tooltip it's not verified yet.
Hence, initiator right clicked it and verified it. The icon changed to a green tick with exclamation mark and right after that it changed back to the previous icon again(a pen with questionmark "?").
How to remain "verified" status?
Issue 2:
The form is still then passed to Manager after initiator submitted. The Manager now suppose to sign the form on Signature field B but error message prompted out when trying to sign!
|--------------------------------------------------------------|
Message box:
The document could not be signed.
There was an error when attempting to commit this signature.
The document was not saved.
A file error has occurred.
|--------------------------------------------------------------|
Anyone faced this before? Any ideas?

Hi all,
For your information:
1. The form .xdp is designed by using Adobe LiveCycle Designer 7.1.
2. Form Manager is being utilized for this workflow.
3. The workflow contains 1 form only. It needs to be signed by both initiator and the manager on different signature fields.
4. I'm using Document Variable to pass the form.
Added Information for issues mentioned:
Issue 1
The initiator signed the form on Signature field A, and then the signature icon (a pen with questionmark "?") appears on top of signature. From the tooltip it's not verified yet.
Hence, initiator right clicked it and verified it. The icon changed to a green tick with exclamation mark and right after that it changed back to the previous icon again(a pen with questionmark "?").
How to remain "verified" status?
The case is whenever it's been verified(by right click and verified it), it will become verified for not more than 1 second and immediately it changed back to "is not verified", no matter how many times the initiator tried to verify the signature.)
Issue 2:
The form is still then passed to Manager after initiator submitted. The Manager now suppose to sign the form on Signature field B but error message prompted out when trying to sign!
|--------------------------------------------------------------|
Message box:
The document could not be signed.
There was an error when attempting to commit this signature.
The document was not saved.
A file error has occurred.
|--------------------------------------------------------------|
When the manager got the signing error, he then cleared the initiator's signature(right click and clear) , and then he is able to sign on both signature fields! And both signature are not verified (with the signature icon-a pen with questionmark"?").
I don't why the manager can sign now.
Quote Will's
"Secondly, when a form with a signature is signed a second time the first signature will indicate that something has changed on the Form - specifically the second signature field.-by Will"
but now the form with a signatuer cannot even be signed for second time. As the error message prompt whenever the manager tries to sign on the signature field B.

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