So, I screwed up pretty nicely in the
http://www.ros.org/wiki/navigation/Tutorials/RobotSetup tutorial and gave example parameters that do not actually match those read by the code. I imagine that this means many of you are using the default acceleration limits for your robots rather than the ones you meant to set. If your configuration for the base_local_planner includes the following spellings of the acceleration limit parameters:
acc_limit_x: my_y
acc_limit_y: my_th
They will be ignored by the code and you'll need to switch to:
acc_lim_th: my_x
acc_lim_x: my_y
acc_lim_y: my_th
Again, I apologize for this and I've fixed the documentation. I'm also going to take some time today to go through all the launch files I can find in our repositories fixing this error. I'm pretty sure that I copied the wrong text along with the rest of the world in at least a few places.
Truly sorry again... I just want to make sure that as many people as possible hear about this mistake as possible.