How do I create a certificate to remove signature field issues?

I would like to start using digital signatures for some internal documents. We are a small site with about 20 PC users (3 of them Apple).
We can create PDFs with signature fields but every time we sign the document, when somebody needs to sign again (for approval of the first sign), then a constant message "file has been modified since it was signed" and also "at least one signature has problems......"
The way I created the forms is by adding form fields and then "Extend features in Adobe Reader" as only the 3 Apple devices have Professional version of Acrobat.
What is the correct way to do this? I think I need to create a Trusted certificate, of course for the size of our site I don't want to have external solutions, especially because it is for internal purposes only.
Any help would be appreciated.
Thanks.

How the signing certificates that you use for all signatures were procured? Were they created by a reputable Certificate Authority (CA) or are they self-signed certificates that you can create in Acrobat and other apps?
If they are self-signed certificates then you need to explicitly trust each of them on each Acrobat/Reader installation. You can use (Acrobat XI/Reader XI) to do that:
1. Right-click on the signature, select "Show Signature Properties...->Show Signer's certificate".
2. In the left pane shows the signer's certificate. Select it.
3. Select "Trust" tab on top and in this tab "Add to Trusted Certificates". Again for self-signed certificates you need to do that on each Acrobat/Reader installation.
If you got your signing certificates from a Certificate Authority #2 above shows the certificate chain. Select that top-most certificate in the chain and add trust for it as in #3. Chances are that all your certificates were issued by the same CA. In this case you need to add trust to only this one certificate on each Acrobat/Reader installation.
You can use Export/Import Security Settings feature in Acrobat to make this process easier. This feature was discussed at length in several discussions on this forum <Re: Small Business Digital Signature Set-up>. Search for "Export/Import Security Settings" for more info.

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