I'm having the same issues with myfilestoredotcom redirects. Regardless of where I'm coming from. I've clicked on links from facebook, google and even manually typed the forum address and it would randomly redirect to myfilestore. When closing the tab/browser and trying it again, it would come to the forums as normal. Googling "myfilestore redirect vbulletin", it seems this is a pretty common issue with plugin exploites and/or sql injections.