iScreensaver version 6.8.4 has a number of bug-fixes and improvements, including several bugs that could cause playback failure on multi-monitor macOS Apple Silicon / M1 systems or the macOS Ventura 13.0 beta. Authors who are building screensavers that may be encountering any of these issues should update, re-build, and re-distribute their screensavers.
Error loading image on Mac
Some of the users whom I've distributed the screensaver to get a lank screen showing "Error loading item named 'Noise 2560x1600.mp4' from id=0E021C6643@1x.mp4"
I have verified that the movie (Noise 2560x1600.mp4) is in the correct location with proper permissions, but the error persists. Only a handful of users get the error, and it does not seem to be OS specific (10.14 and 10.15).