This is a known bug in the Suite 9.5 update when processing images with film grain turned on in the Perfect BW module. If you have applied a preset that includes film grain or have turned on the file grain feature, the image will appear in the preview correctly, but when you click Apply the image will be saved darker than what was being displayed in the preview area. Unfortunately we do not have a fix for this issue at this time. However, you will be able to turn off the Film Grain feature and the image will be saved correctly.
If you are in need of using the Film Grain feature in Perfect BW, we can roll you back to the previous version (9.0.2) to fix this problem. To roll back to the previous version, please reinstall from the links below. Please make sure you download the correct version. You will not need to uninstall prior to installing from the links below.
Suite 9.0.2 Premium Edition:
Suite 9.0.2 Basic Edition: