It's really just the display and how Stop Forum Spam works with IP addresses (which is quite simple, it doesn't support it). v7.6.0 will not process IPv6 through SFS as it won't work, until a said time that they choose to support IPv6.

The SFS system in v7.6.0 has been completely rewritten and moved to the script file (versus being in the templates) so there isn't really a method of patching it; you could disable registration checks through SFS currently until v7.6.0 is released.

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