An SNS alert came out advising customers of an issue with GTI to the point they recommend temporarily disabling it. You'll find it in your gateway anti-malware ruleset in the advanced properties of "Gateway Anti-Malware" in the "Block if Virus Found" rule.
I've not seen huge impact with this honestly. I think I saw a Jenkins developer download get blocked that looked like a false positive, and maybe one other thing today that looked like a more legitimate block, so I'm leaving it enabled for now in this customer's environment.
on 7/31/13 5:08:14 PM CDT
The major impact to customers was those running On Access Scanner on desktops and servers. MWG blocked whereas OAS quarantined files and logged that they had been deleted.