When launching QCad under Windows, I can only see the startup splash screen and nothing happens.
This might be caused by switching the language to Spanish under some Windows installations. Please switch the language bak to English and restart QCad. To reset the language to English, please delete the file "qcadrc" or "qcaddemorc" in the directory "C:\Document and Settings\All users\Application Data" or "C:\Documents and settings\all users\datos de programa", depending on your installation.
Note that the file "qcadrc" or "qcaddemorc" might be hidden by default. To make the file visible, change the following setting in Explorer: "Panel de control/opciones de carpeta/ver/archivos y carpetas ocultos".