Thanks to Catherine for getting back to me privately. Even so, I had already figured that nothing was actually wrong other than my understanding of what to expect. This is the first time I've used the DNG format and didn't realize how it apparently is supposed to work. Once I loaded the DNG into ...

Suddenly and unexpectedly, when Helicon Focus is outputting a DNG file, the file is only 256 x 170 pixels whereas it is outputting a TIF of the same stacked photo as expected at 6042x4020. This has never happened before but it has now happened twice in a row.

Any ideas?

I'm using Helicon Focus ...