I received calls about pdf files starting to take a lot longer to open.
The culprit? Adobe Reader “Enhanced Security“. This is apparently the result of an update, and the new settings automatically call for Adobe to look up a “policy file” for the document. Of course security is a good thing, but in this case, too much security will slow you down. If you have up to date antivirus protection, anti-malware protection, a good firewall, and you’re careful about opening files from trusted sources, this is a case where you probably don’t need an extra layer of protection.
To revert the settings, in Adobe Reader, go to “Edit” and select “Preferences” from the pull-down. In the “Preferences” window, under “Categories” select “Security (Enhanced)” which is about 3/4 down the list. Then un-check the “Enable Enhanced Security” box.