AI offers this, though it may not be 100% accurate...
"Yes, this is a fairly common issue that PhotoStage users have reported — the preview sometimes skips slides or jumps directly to the end of the slideshow. This behavior is not usually related to your RAM upgrade; instead, it tends to be linked to how the program handles slideshow previews and transitions.
Why the Preview Skips Slides
PhotoStage generates a real-time preview directly from the timeline. If your slideshow includes high-resolution images, video clips, transitions, or effects, the program might not be able to keep up with playback speed in real time. As a result, the preview can appear to jump or skip to the end, even though the exported video will render normally once saved as an MP4 or similar format.
Some users on the NCH Software forums report that this happens even on high-performance systems. The issue often resolves itself after exporting the slideshow, as the export process fully renders the video frame-by-frame — unlike the low-resource live preview.
Tips to Fix or Work Around It
- Try reducing the preview resolution under Options → Preview Settings to improve live playback performance.
- Close other programs while using PhotoStage to maximize available CPU/GPU.
- Simplify transition types or reduce duration for smoother previews.
- Test the final output by exporting — the export should play correctly even if the preview skips.
How to Check for Updates
To check for updates in PhotoStage:
Open PhotoStage.
Click on the Help menu at the top.
Select Check for Software Updates — this will prompt the app to look for the latest version directly from NCH Software’s update server."
Or download from here.