"Relax, Don’t Worry, Have a Homebrew." - Charlie Papazian
A couple of years ago I made "Hank's Hefeweizen" (using Wyeast 3068 Weinhenstephan Wheat Yeast) as a kit from Northern Brewer. To save time I used the extract kit. It had a wonderful banana character - damn close to a good German...
I agree with the others - it 'looks' ok and is probably just a yeast growth that clumped.
What did it smell like? If it smelled/tasted ok I'd say you're good...