I am having a problem using an FTDI-USB converter on 12.04; it works perfectly on my Ubuntu 9.04 and Windows.

The FTDI USB converter shows up as ttyUSB0, but I am unable to connect to it! Can you see anything wrong here or point me in the right direction? I have all updates installed.

$ uname -a
Linux ubuntu 3.2.0-31-generic #50-Ubuntu SMP Fri Sep 7 16:16:45 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
$ dmesg
[28663.644817] usb 2-2.3: new full-speed USB device number 28 using uhci_hcd
[28663.834916] ftdi_sio 2-2.3:1.0: FTDI USB Serial Device converter detected
[28663.834938] usb 2-2.3: Detected FT232RL
[28663.834940] usb 2-2.3: Number of endpoints 2
[28663.834941] usb 2-2.3: Endpoint 1 MaxPacketSize 64
[28663.834942] usb 2-2.3: Endpoint 2 MaxPacketSize 64
[28663.834943] usb 2-2.3: Setting MaxPacketSize 64
[28663.846471] usb 2-2.3: FTDI USB Serial Device converter now attached to ttyUSB0
$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse
Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub
Bus 002 Device 016: ID 0e0f:0008 VMware, Inc. 
Bus 002 Device 028: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
$ ls /dev/ttyUSB*
$ sudo screen /dev/ttyUSB0 9600
shows... a blank screen :(
Someone had a similar problem here: http://ubuntuforums.org/showthread.php?t=1717311. However, they say they got one write and one read and then it fails. They fixed it by manually setting one of the lines, but I don't think I have the same problem because if I can successfully recognize the device as a USB-Serial converter, doesn't that mean it's all hooked up correctly?

Any help would be greatly appreciated!