Several Windows 7 versions (i.e. the 32-bit ones. AFAIK, all 64-bit versions work with dyes) spit out an error if you try playing with Anthem.exe, some sort of palette error that makes no sense, though. For that reason, one of the former devs created the Anthem_win7.exe client for people getting the weird palette errors upon logging in. A side effect is that you cannot see dyes, though, and no, we unfortunately do not know of a fix (yet).