Unable to detect iCreate

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Hi all, I am in the process of setting up my newly-built Turtlebot and am having an issue with ROS detecting my Turtlebot that is connected to my computer via a USB to Serial adapter. Any help would be MUCH appreciated. I have not confirmed that the USB to Serial adapter works in any application, but its presence in "lsusb" assures me it is running.

I am using the same machine as both my Workstation AND Turtlebot laptop (for now): Thinkpad T410 Running Ubuntu 12.04 Precise, ros-fuerte installed. For my network setup, I simply gave the same IP twice. I am now attempting to run this tutorial (http://www.ros.org/wiki/turtlebot_bringup/Tutorials/TurtleBot%20Bringup) but I get grey buttons in the dashboard. My IP addresses are correct (Unless Turtlebot is absolutely incompatible without two separate machines), so I performed some of the tests mentioned in the Networking tutorial (http://www.ros.org/wiki/Robots/TurtleBot/Network%20Setup).

The Turtlebot is charged, every cable (Kinect, iCreate via USB-Serial adapter) is plugged into my box, but I still receive the following output:

    ~$ lsusb
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
    Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
    Bus 001 Device 003: ID 17ef:480f Lenovo Integrated Webcam [R5U877]
//This is the USB to Serial converter I'm using: 
    Bus 001 Device 007: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
    Bus 002 Device 018: ID 0409:005a NEC Corp. HighSpeed Hub
    Bus 002 Device 019: ID 045e:02b0 Microsoft Corp. Xbox NUI Motor
    Bus 002 Device 020: ID 045e:02ad Microsoft Corp. Xbox NUI Audio
    Bus 002 Device 021: ID 045e:02ae Microsoft Corp. Xbox NUI Camera

    ~$ sudo service turtlebot start
    turtlebot start/running, process 19893

    ~$ rostopic echo /diagnostics
//Yadda Yadda laptop info, then:
    ---
    header: 
      seq: 49
      stamp: 
        secs: 1348390103
        nsecs: 269546031
      frame_id: ''
    status: 
      - 
        level: 2
        name: TurtleBot Node
        message: Failed to open port /dev/ttyUSB0.  Please make sure the Create cable is plugged into the computer. 

        hardware_id: ''
        values: []