The loader is failing its pre-flight checks—most commonly a missing or corrupted license or an incompatible graphics driver (for WinCC Advanced/Comfort panels).
If you have ever worked with Siemens WinCC (TIA Portal or Classic), you have likely encountered the term WinCC Runtime Loader —either as a background process in Task Manager or as a frustrating error message preventing your HMI from starting.
A child process (e.g., a custom C-script or a SQL query) did not terminate gracefully. The loader is waiting for a handle that will never close.
About the author: A automation systems integrator with 10+ years of experience in Siemens TIA Portal, PCS 7, and WinCC Open Architecture.



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