Are you using the Mac or PC version of the ISF Editor? On Mac, the ISF editor shares its output via syphon, or you can use VDMX to display the ISF shaders directly.
Thanks but saw this thread before I posted mine. How do I add other files from *src_ISFs folder into the videosource in ISf-editor? Or maybe I do not understand something?
The video source files are built into the ISF editor application itself. I do not believe you can add additional sources into it on mac. Perhaps there’s a folder in your PC app prefs that contains those shaders (or where you could add more).