We have submitted version 4.3.8 of iScreensaver Personal to the Mac App Store (MAS).
This version includes enhanced support for Mac OS X 10.7 Lion, and for the newest version of Safari (5.1) that has been released for use with Mac OS X 10.6.8,.
It includes numerous other small bug-fixes and improvements.
As soon as Apple approves version 4.3.8, we recommend that all users upgrade via the Mac App Store, re-build your screensaver(s), and re-install them.
I just purchased your app today and after spending several hours working on a video in Premiere Pro and successfully creating a screensaver via your app... it doesn't work.
When in the Sys Prefs and running the screensaver in 'test' mode it works perfectly. When actually trying to activate it in the Finder, it fails every time. It starts up but quickly quits out.
As you may or may not be aware, part of the deal with the Mac App Store is that businesses have no information about customers. We are sorry to hear you are disappointed, and you are welcome to try to get a refund, but that transaction is 100% between you and Apple Inc.
The solution is to re-export your video to a different codec. Usually just re-exporting it as an H.264 file from within QuickTime Pro will do the trick.
If this does work, we hope you can give us a good review on the store.