I had an issue with Adobe Acrobat erroring with an error message relative to the Crypto file in Windows. I attempted to do the file folder renamaing to 'old', etc. to no avail. When I tried to restore everything to it's original state, the sign document window appears (see below), but when I click on the sign document buttone, nothing happens at all. I have tried this in multiple documents, through multiple siging routes, and all the same non-result. I have also reinstalled Acrobat to no avail; advice?