Digital Light & Color

An update is available to Version 8.0.508 (27-May-2025)
Download Link: https://www.dl-c.com/Downloads.html

The changes (taken from the update log) are:

Projection transformation: Radius setting is now normalized to image diagonal so the same setting has roughly the same effect regardless of image size. Added examples to help file and Transformations.pdf.

Updated ExifTool to 13.30.

Tried playing with Projection, and if you set the radius to zero, PWP goes away. (I am not asked to recover the workspace when I reopen PWP).
Seems fine on values down to 0.01, but does not like 0.0. Update: shows a result with Spherical option, but then goes away, and I am prompted to recover the autosave workspace. But this is not the same as for the other two options.

Indeed, radius = 0 is a degenerate case -- for the next release the minimum value is limited to 0.01.