Acrobat Standard 8 - why is the digital signature not responding?

Using Acrobat version 8 and it is fully updated.
When I try to insert a digital signature, it freezes and when I eventually close the digital signature window, it says it is not responding and the program shuts down.
This is using a document that I use frequently and only recently started having problems with the digital signature.
Why is this happening and how can I fix it?
Thank you!

Hi,
I'd like to clarify some points. You use a digital ID to create a digital signature, not unlike how you use a pen to create (what we refer to as) a wet ink signature. When it comes to applying a digital signature to a document, you can sign just about any blob of electronic data. You can sign your e-mail or a MS Word document as well as a PDF file. The signature itself lives either in the document (that's how Acrobat does it when signing a PDF file), or it can be an external attachment (that's what the smime.p7s file is you might see attached to some e-mail messages).
Here is where I'm a bit confused. How many digital IDs do you have access to? If you only have one, does it cause Acrobat to lock up when signing a specific PDF file or when you try to sign any PDF file? Same question if you have more than one digital ID available to sign with, they all cause Acrobat to lock you when signing just one specifc file or any file? When you try to sign, are you signing an existing signature field, or are you creating a signature on the fly, be it either visible or invisible? If it is just one file that is causing the problems then that file is probably corrupt. If it's any file then it is a more systemic problem and I don't have an off the shelf answer for you.
Steve

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