iScreensaver version 6.8.5 has a number of bugfixes and improvements, including fixes for several issues that could cause issues when running under macOS Ventura 13. Authors distributing screensavers for macOS clients should update, re-build, and re-distribute their screensavers. Authors only supporting Windows clients can upgrade at their convenience.
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).