The anti-virus software of AVG has an update and it addresses many stability bugs.

One of the bugs is that the software crashes when scanning a malformed UPX compressed executable file. Another bug is about a traffic-spewing behaviour on LinkScanner which overinflates a site’s visitor statistics. This affects sites that rank high in search engine results pages. Therefore, when this bug occur, it uses a ton of bandwidth on a site’s server according to the article.

Approximately 30 flaws were fixed in the update and the update changed the engine of the software which means that it is not a typical update since it just did not add new malware definitions.

Source: The Register