With Lion, Mac no longer recognizes flash drive or Kindle.

I am using a 13-in unibody Macbook (late 2009) running OS X Lion 10.7.1, and I am having trouble using flash drives and my Kindle. USB-connected printers still work, and my USB-connected tablet also works as normal. Flash drives and my Kindle show up in Disk Utility, but show to already be mounted even though they do not appear anywhere else. My only option is to eject them.
This is extremely problematic as I work off of my flash drive for school and need access to the files on it at home. Immediately after upgrading, both my Kindle and flash drives worked just fine. This seems to be a recent development, and I can't figure out what happened. I have not installed any new programs or made any system changes since just after upgrading, and the drives still worked fine then.
What's going on?

Hey lorrainefrommalibu,
Thanks for the question. I understand that your iOS devices are not being recognized by iTunes on OS X. The following article may help to resolve your issue:
iOS: Device not recognized in iTunes for OS X - Apple Support
http://support.apple.com/TS1591
Follow these steps to resolve your issue:
If you haven't connected your iOS device to this computer before, unlock the device and tap Trust. Learn more about the Trust This Computer alert.
Restart your iOS device.
Restart your Mac.
Make sure that your Mac meets the minimum system requirements for your iPhone, iPad, or iPod touch.
Install software updates on your Mac.
If an iTunes update is available, apply the update.
Check USB connections. iOS devices need USB 2.0 to work properly. If you're not sure your Mac has USB 2.0 ports, check the computer's specifications.
Disconnect other USB devices and connect your device directly to a USB port on your Mac.
Try another USB cable.
Thanks,
Matt M.

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