Hello, I noticed strange behavior of ND yesterday regarding using other addons like TOPCAT and Luis Gordo Instructor Station especially. I use P3D v2. When I choose weather or aircraft load via P3D, all works fine, but when I inject weather from IS, or fuel/payload from TOPCAT, route on ND display is suddenly not correct, I get yellow dashed lines perpendicular to the runway direction. I can see programmed waypoints itself, but they are not interconnected, I can not use an automated flyight. When I inject CLEAN WEATHER after that, all navdata immediatelly restores, and looks normal. It happens every time I switch weather via FSUIPC/WIDE FS from another PC. I have try it several times during normal flight. I realize about any kind of interaction. I have the last version of FMGS with all available updates. I use only one PC setting for tests now. (waiting for electronics):p Thank for your advices. Jiri