I have a MacBook Air which I think is infected. Just about every time I go to facebook after a few minutes (or seconds sometimes) I get abruptly redirected to another website. Lately that other site is crackle.com. In the past it has been to something called rugged.com or therugged.com. I have clamx installed but it finds nothing. I tried the Mac version of Avast, which I understand is in beta. A full scan gives me some warnings, but what do I do about those warnings? The program's preferences offer no options to isolate them. Some of the warnings refer to a "decompression bomb" which I researched and those may or may not actually be problems.