Command blocks "run" command when powered, but has no effect.

First time with issue:
– Attempted running command in a fill clock:

/execute @e[team=Blue] ~ ~ ~ scoreboard players set @e[name=RMMage,r=8] NearPlayer 1

--Predicted Result
Entity added to scoreboard.
--Result:
Entity not added to scoreboard.
--Attempted Fixes
-Restarted Minecraft
-Changed Version
-Replaced command block
-Moved location of command block
Nothing worked.

Second time with issue:
--Attempted running command:

/entitydata @e[score_NearMinion_min=1] {Attributes:[{Name:generic.movementSpeed,Base:0}]}

--Predicted Result:
Entity stops moving (movement speed set to 0)
--Result:
Command block output declares that command has worked. Entities still frolicking.
--Attempted Fixes:
-Changed Minecraft version
-Replacing command block
-Location change
-Destroyed command block, created new redstone clock, set up command block to the new clock.
This was a temporary fix; the mobs stopped moving when predicted. However, exiting world and then re-entering made this fail as well.

--Recreation of Bug:
So far, I have only had this bug when I try to create a redstone fill clock and attempted to run about 46 command blocks per tick.

This bug is possibly present when many commands are targeting too many entities.
Evidence of this is that all of these commands are targeting at least 4 zombies.

I am willing to give more evidence if requested (I do not know what else is needed).