How do creatures with incorporeal movement pass through a Wall of Force?

UPDATE: Sage Advice Compendium – D&D’s official rules FAQ version 2.5

RAI, with the Echo Knight, is it supposed to be susceptible to Fireball? How about Shatter?

Can Distant Spell be used to increase the reaction trigger requirement for Counterspell to 120 feet?

Can Cutting Words affect Initiative Rolls?

If a concentration spell specifies an effect “within range” and the caster moves, is the range measured from the point the spell was cast or the casters new position?