With
SourceMod 1.11 becoming stable, it adds a new feature which disallows the use of file extensions that aren't
.smx which effects all older versions of FF2.
When you plan to upgrade SourceMod, make sure to update or change your FF2 version to support this. You can add code such as
this example.
Dynamic Defaults, Drain Over Time, and Ability Management System is also known to now break with this update which requires changing the includes from .ff2 to .smx and recompiling plugins that support them.
With this official versions of FF2 no longer work straight as is without modifications. (And I never did a official release of Unofficial Freak Fortress.) Freak Fortress Rewrite is still early in it's life and may present some issues but I'll likely prioritize so this can be the norm for players without coding experience to make the adjustments needed to run FF2 on newer versions of SourceMod.