I have been using the plugin for some time and I find it very useful. However I have recently noticed that it only redirects the non-www links. Currently www links result in a 404 error.
I have my site link preference set to non-www in webmaster tools. I had it set to no preference for quite some time before this - although I do not know if this is related or how long these 404 errors have been going on.
Any help would be greatly appreciated!