Many of us noted that the new 733 was having major problems maintaining a steady climb rate and holding an altitude (with deviations +- 300 or more). It appears that XUIPC is the cause of this problem. Disabling and/or removing the plugin completely has cleared up the issue for a couple of us and made the plane behave quite a bit smoother overall. I would expect to see more info on X-Pilot. Just a note for those taking on to the network and the fine controllers that may find themselves pulling their hair out

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Edit: You also need to restart gizmo after disabling XUIPC