Using a command to teleport AreaEffectClouds gives a success message in chat but no change in location is visible unless logging out of the game, and back in (no need to completely restart the client).

I'm using a command like /tp @e[type=AreaEffectCloud,name=Rules] ~ ~2 ~ or /tp @e[type=AreaEffectCloud,c=1] ~ -0.5 ~ or /tp @e[type=AreaEffectCloud,r=9] ~ ~ ~.05 (in other words using a combination of type, count and radius as paramaters and all having the same result.

Using a kill @e[type=AreaEffectCloud,c=1] or a /summon is immediately effective, though.