Thanks a lot for trying to help me, but unfortunately the new special script renders my whole FMC v3 unit unusable. I'm now using the original script with the modification you provided, which works perfectly.
Both the manual and readme of v2 clearly state: "When flying in your home cockpit and you don't have any hardware for the OVH panel, you MUST push the MCP C/O button to initiate your modules windows." But what if I don't have an OVH panel and an MCP? I only have an FMC v3. Also, the EXEC, ...