I set my S5 up Friday, and had a clicky x axis bar. Run through the calibration that was posted above, and that should take care of the mechanical part. I have also learned that the default profiles included with cura are in no way appropriate for engineering level work. Right now i have it set up on the tough PLA with a .3 layer height, .35 line width, 99% flow, 40mm/s speed on everything except the first layer, and acceleration and jerk control turned off, and uncheck infill before walls. This is producing beautiful prints that are within 0.001" for me. This could probably use some more tweaking, and YMMV, but it's miles better than the stock profiles, and really makes the printer worth the cost.
If Ultimaker is going to market a printer in this price range for engineering type work, they really do need to set up profiles for dimensional accuracy right out of the box. Had I not found another post detailing most of those settings, I would be sorely disappointed in the performance as well.