For your PTP issue check this KB -
Proactive Threat Protection shows disabled and does not update definitions after install
http://www.symantec.com/business/support/index?page=content&id=TECH93621&locale=en_US
Regarding USB drive:
The File System Auto-Protect scan is the only type which would automatically scan a USB drive connected to the system. This type of scan, by default, would only run when a file is accessed or modified (scans the files when they are written, opened, moved, copied, or run).
Does Symantec Endpoint Protection or Symantec Antivirus Scan USB flash drives?
http://www.symantec.com/business/support/index?page=content&id=TECH102573&locale=en_US
You are not in the Endpoind Protection forum, I will move this thread over for you.
Best,
Thomas