Luts does not work

[Austin]

Are you using Windows? If so, there are certain folders that Windows might protect and potentially prevent Shotcut from reading or writing as a security precaution. Remarkably, the Desktop and Downloads are among those folders. If your LUT is in Downloads, that could be an issue. There is a way to turn this behavior off if this describes your situation. Or move all the source files to unprotected folders elsewhere.

Export fails with "[consumer avformat] Could not open"

Thank you for replying with that excellent workaround! https://support.microsoft.com/en-us/help/4046851/windows-10-allow-blocked-app-windows-security And from Protect important folders with controlled folder access on microsoft.com: Protected folders are specified when controlled folder access is configured. Typically, commonly used folders, such as those used for documents, pictures, downloads, and so on, are included in the list of controlled folders.