So the recommended option isn't so recommended after all.
Perhaps that's not working for you...but the default install path is the best way to ensure that there's no write access error (that may occur otherwise)
Would you mind making this last test and tell me what happens?
1) Rename the 'Data' foler inside the '.../Program Files/mGalaxy' folder to 'Data_Old'
2) Open 'C:/Users/Home/AppData/Roaming', create a 'mGalaxy' folder if it doesn't exist.
3) Copy the content of '.../Program Files/mGalaxy/Data_Old' to 'C:/Users/Home/AppData/Roaming/mGalaxy'
Launch mGalaxy, then mGalaxy_Runway.
Thanks