Since the release of PDFsam Basic 4 we had some support requests regarding the application being unusable and starting with a white screen on Windows.
After some investigation we found some tickets on the openjdk bug tracker here, here and few others, we tested the proposed workaround and it seems to have fixed the issue for those users experiencing the white screen.
- Open with a text editor the file
pdfsam.l4j.iniin PDFsam Basic installation directory
- Append a new line
- Close and save
- Start PDFsam Basic