Cisco TAC reports this is normal behavior and Global Correlation updates are attempted every five minutes. The error messages above are cosmetic - according to the TAC. However - two defects are currently filed related to them and will be addressed...
I upgraded mine yesterday and am seeing these messages too - once per hour. My sensor is setup to check for signature updates every six hours - so it's not that. I also thought it might be related to the Global Correlation updates - but one occurr...