Bukkit

What steps will reproduce the problem?
1. I made the following changes in the config.yaml file...
     MagneticRail: true
     MaxSpeedPercent: 500
     ControlBlocks:
       POWERED_RAIL:
            - "(ON) [set speed:2x]"
            - "(OFF) [set speed:0.5x]"
       IRON_BLOCK:
            - "(ON) [magnet:on]"
            - "(OFF) [magnet:off]"
2. After restarting the server (and reloading the config.yaml file), I placed a block of iron and set a regular track over it (no redstone signal).

What is the expected output? What do you see instead?  I was expecting the cart to fall off the track when travelling at such a high speed without the magnetism, but it doesn't - as if the magnetism is still on.

What version of the product are you using?
    MinecartMania Reborn v2.3.1
    Using CraftBukkit 1.6.2-R0.2

Do you have an error log of what happened? No, the console shows that the IRON_BLOCK is configured when starting the server with the following messages...
     [MinecartMania] Adding control block: IRON_BLOCK
     [MinecartMania] Adding Magnet(redstone Enables)
     [MinecartMania] Adding Magnet(redstone Disables)

Please provide any additional information below.
     I've tried using different blocks.  I checked to make sure the data value of the IRON_BLOCK in the items.txt file was correct.  I tried using different redstone circuits.  I made sure the IRON_BLOCK was receiving a redstone signal using a lever and redstone torch.  Nothing seems to work.  The reason I installed this plugin was to increase the maximum speed of the carts and have them stick to the track by default, but give players the option to disable the magnetism.

For some reason I can't get spawn signs to work...

I tried this(http://i.imgur.com/hbUjGfN.jpg) to see if maybe the carts were trying to spawn in the diamond block and not on the track. If that were the case, the cart should have fallen onto the next track and worked normally. However, the problem persisted.