If you have fuzzy AI installed, you may want to fix a typo. Open up RuleBasedAI.cs and scroll down to line 393.
This will be in the section for jumping straight, but you may notice that the code says

ButtonPress[][] jumpSimulatedInput = this.jumpBackwardSimulatedInput;

which should be changed to

ButtonPress[][] jumpSimulatedInput = this.jumpStraightSimulatedInput;