Luke 1248 First welcome to the discussions.
If the Toshiba worked before the upgrade it will work again.
First thing I would do is Unplug it the go to your Black Apple and make sure that your Software is UP TO DATE.
Restart your computer and then Plug in the Toshiba again and see what you have. If it still doesn't work Go to Toshiba's Web Site and see if they offer a New Driver for there Product. I hate to say this but Apple sent the Maverickks Operating System to All of the SoftwareDevelopers to make sure there product worked with the different periphrials and softwares.
Some are a lot faster at responding then others, and naturally all users try to blame Apple on there products or Software not working. The fact of the matter is it is those that have made the software and different periprials who are to blame for sitting on there hands.
Come back and tell me if this worked for you.
Cheers
Don