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G'day Folks. I had the same issue a while back. The problem is the hosting provider had made changes to the security of the server. I believe the changes were made to the mod_security, though i'm not 100 percent sure. I spoke the the hosting company who then returned the security setting to what they were previously, and that fixed all of the 406 errors. Everything works fine now. My syggestion to ppl are having this issue is to contact your hosting service and ask them to have a look at the security settings. When I spoke to my provider, they new the cause straight up, so I'd think it is a fairly simple issue for them.
Cheers