Old good

falsepatternlib-mc1.7.10-0.9.4.jar
SpongeMixins-1.2.0.jar
triangulator-mc1.7.10-1.7.2.jar

New bad

falsepatternlib-mc1.7.10-0.10.3.jar
SpongeMixins-1.2.0.jar
triangulator-mc1.7.10-1.7.4.jar

Log:
fml-client-latest.log

Mixing client.vanilla.TessellatorMixin from mixins.triangulator.json into net.minecraft.client.renderer.Tessellator
is absent, and
java.lang.ClassCastException: com.falsepattern.triangulator.mixin.plugin.MixinPlugin cannot be cast to org.spongepowered.asm.mixin.extensibility.IMixinConfigPlugin
is likely related.

The "Triangulator is not calibrated" message comes up, so the mod does load, it's just the mixins that don't get applied.

Works again with Triangulator 1.7.5 + FPLib 0.10.4.