On February 20, 2015, Symantec received reports stating that 32-bit versions of Internet Explorer had been crashing after the application of the Intrusion Prevention System (IPS) 20150220.001 definition package. We can confirm that this definition package impacted 32-bit versions of Internet Explorer on computers with the following Symantec and Norton products installed:
Only Symantec Endpoint Protection clients that receive content from a pre-RU2 SEPM, or pre-RU2 clients that run LiveUpdate directly to Symantec may be affected.
Based on our analysis, the issue was caused by a corrupt file in the virus definition set. Symantec recreated a snapshot of the same definition package as 20150221.001 and released it through our LiveUpdate servers.
Definition package updates are automatically deployed by Norton and Symantec Endpoint Protection every four hours, unless users manually download them for unmanaged computers or administrators manually deploy them to their managed clients from the SEP Management Server. Users can also manually deploy the update before it is deployed automatically.