As Matt said, the rudder line came loose/untied....and the fix is simple.
If you open up the aft hatch, you should find a heavier black braided line....about 1/8" diameter on the right side.
This line is fed into a hollow tube, that enters the rudder turning assembly located under the black rectangular cover.
Remove the four screws holding the cover in place.
Feed the black line through the hole, going down to the rudder and into the hole located at the top, back edge of the rudder.....tie a figure eight knot in the end so the line will not come loose again.
Page 24 in the owners manual shows the rudder turning assembly
http://static.hobiecat.com/digital_asse ... 140325.pdfIt does not show the black line feeding the rudder for up/down use, but you can see the inner workings of the turning drum and other adjustments if needed.