Updated to pb14 today. Seems worse than pb13. Cessna is totally uncontrollable. Veers left and right with tire squeal during takeoff. The sim stutters constantly at 55fps. Payware aircraft throttle problems(can't advance,Fps drops when advance throttle forward, sim will hang up). When landing as soon as you touch runway ,plane wants to veer left and right.I was asked to submitted bug report for pb13. I am not the only person with these problems. Now this sim seems a lot worse than before. Testing conditions, clear sky and no wind. By the way Xp 10 works perfect. I can basically simulate all the features that Xp 11 has ,by downloading files from various sites, from the xplane.org . Also i have reset all of my settings in preferences file. Reconfiged every thing, within Xp11.