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

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Just a week ago I update my AVG to version 8.0. It’s free version. But than I found that my Firefox got error every time I open many tabs. Previously, I never had this problem. Even when I open 10 tabs in the same time..Do you think it relating with the AVG update? I already re-instal my FF, but it doesn’t help.