Well, if SkyMaxx appears to be the culprit, standard diagnostic technique would dictate to test your system without it. Use the SkyMaxx uninstaller to remove it. Then, to be sure that X-Plane is in a known state, run the X-Plane updater to be sure that any textures or other files are properly restored. EDIT: How were the Gizmo64 plugin(s) installed? Was it with the SkyMaxx install and/or a Gizmo-driven aircraft? (There should be only one Gizmo installation in the X-Plane plugins folder.)