StuffIt 12 may conflict with Norton AntiVirus. (But why are you using either of them?)
StuffIt Expander 10.0.2: Conflict with Norton AntiVirus
Intel-based Macs: Symantec releases Universal Binary of Norton AntiVirus
Utilities Updates: Symantec Norton AntiVirus 10.0; Mozilla 1.7.8; Firefox 1.0.4; more
The social network says its blacklist has also been augmented by the security firms, which have offered up their own URL blacklist databases.
Modern mobile devices don't suffer the same vulnerabilities as PCs, and those selling antivirus software for Android, iOS, and BlackBerry OS shouldn't be trusted.
Norton AntiVirus causing issues with temp files resulting in system freezes
Though the Mac has been known to be relatively malware free, the platform's rising popularity is seeing more malware focused toward it.
It appeared the head of Norton AntiVirus was ducking the virus threat to Windows PCs completely -- by using a Mac
Before it was flagged and removed, one of the most successful apps on Google Play for over a week was an "antivirus" app that did nothing other than change an image.