Thanks for the quick and useful answer. I'll reduce the cache size for HF.

I currently have 64 GB memory, 8GB GPU, and 70% memory cache limit in HF. I do a lot of stacking in HF, up to as much as 750 images in a stack, sometimes manually and sometimes in batch mode. With other things running (like Lightroom and Photoshop), my memory usage is often in the 90's. My computer ...

My bad -- that was another typo in my original message. I did not stack these with Zerene, only with Helicon.

To restate the problem,

When importing to Helicon directly from the camera SD card, the colors are clearly off. As a test, I pulled the images into Lightroom, and then exported them from ...

Yes.

See the last sentence of my previous message: I just installed the latest Adobe DNG converter, and the problem is still the same when I am stacking the images directly from the SD card.

Oops, I accidentally cut something out. The third paragraph should read:

As a test, I pulled the images into Lightroom, and then exported them from Lightroom into Zerene using both "Helicon Focus (DNG)" and "Helicon Focus (TIFF)" . The stacked photo after exporting "Helicon Focus (DNG)" has the ...

I have used Helicon Focus for years, have done probably thousands of stacks, and all of a sudden today I am seeing a BIG problem in color shifting. I have never seen this problem before and am really flummoxed and frustrated.

I import images into Helicon directly from my camera SD card. The colors ...

I am doing a stack of 201 images, very fine steps from Stackshot. Simple subject (a slime mold sporangium). After about 5 minues it stopped with a large red exclamation point, and says "Unknown Exception." I have had this before, but I don't remember the circumstances. I can find no occurrence of ...

I have been having the exact same problem for the last month or so. Always the output is darkened, but fine if I go to the retouching window and fine when saved.

If this is a bug I would sure like it fixed soon. Or if there is a beta version with the bug fixed (as indicated above), I would like to ...