Digital signature only prompts for password with multiple pdf's open.

Hello everyone,

I am currently experiencing an issue where when placing a digital signature we get prompted for a password even with the timeout set to never. This only happens if we have multiple pdf's open at one time. When signing a single pdf there is no prompt for a password. This is using Adobe Acrobat Pro on a Windows 7 machine.

Things I've tried so far:

- Manually changed the timeout to manual, then back to never

- Completely removed the signature (design/.pfx etc...) and recreated

- Complete reinstall of acrobat, all updates completed

So far nothing has resolved this, if anyone has any insight it would be much appreciated!

Thanks!