I'm sure it can be fixed if you keep calm and hold a positive attitude.
There are plenty of people using Freerider successfully on Linux. I'm not a Linux user myself but there are often some very helpful people over at the official RC Groups thread: http://www.rcgroups.com/forums/showthread.php?t=23...
(I'm pointing you over there since you were unable to solve it using MiSKLaCH suggestion and I'm not sure how many other Linux users are actively reading here.)
(Perfect symmetry is not needed by the way, the important thing is the centering).