Following on from Colin's suggestions, if the pause/unpause doesn't work, you can delete the autoloader and rescan for it. This should let it redetect.
Here are some articles frmo the Symantec site to read over:
http://seer.entsupport.symantec.com/docs/237047.htm
http://seer.entsupport.symantec.com/docs/191594.htm (Colin's suggestion)
http://seer.entsupport.symantec.com/docs/255501.htm