Problem with Fbx import with animation and Carrara 8.5 filters

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When I import an fbx with animation, I cant seem to change the key frame tangents in the graph editor. I can change the tweens to other formats but the key frames dont change when i try the tangent buttons.

Is there a reason for this to be the case or it operating as it should?

The new animation filters also don't seem to operate correctly on the fbx files which might just be linked together with not being able to change the key frame tangents.