Wii Key update to version 1.9s has now been posted at:
Resources :: WiiKey.cn :: Official Site of the WiiKey Modchip
This is what has been posted for the update:
This fixes the issue with original SSBB discs not working and it should also no longer be possible to render the chip inoperable by using patched config discs. A new config option to block system updates from DVD is also supported. The 1.9s config discs will be released by the end of this week.
Let us know how it works for you guys.