When selecting photos the preview will show a blank Preview panel in Manage Mode in PaintShop Pro X4.
To resolve the issue with thumbnail images not showing up in the Preview panel, please follow these steps:
1. Make sure that PaintShop Pro X4 is closed
2. Go to the PaintShop Pro X4 desktop Icon
3. Right click on the Icon
4. Select Properties from the pop out menu
5. Select the Compatibility tab in the Properties box
6. Add a checkmark to "Disable desktop composition"
7. Click Apply
8. Click OK
9. Launch Paintshop Pro X4 and preview should display properly.