Take a small taste. If its horrible then there might have been some mold spores in the oranges or something.
And that much yeast cake could definitely make autolysis a problem (it does happen, just not terribly often like older brew books lead us to believe)
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10