Thanks for the report - but I don't understand - can you provide more information? Particularly the steps to reproduce the issue your expected result.

Sorry for the Confusion.

I selected the option to add data for a new session. I would select the Option to select file(s) to add. I would choose a single file. At this point there is an option that can be checked off that says "Single File". It more or less randomly changes between being checked and unchecked without me manually changing it. It is very rare and I think it has to do with data from the file I'm loading but it took some time to figure out. I will add a photo as well.

Hope this helps

Are any heuristics used to populate the "Single File" checkbox while preparing for data load?

It seems like the problem is that this checkbox is occasionally, unexpectedly checked when loading DICOM data. Thus if you don't "show options" and uncheck the "Single File" box you end up loading only a single slice when you meant to load a volume.

The unexpected part comes in because it seems that most of the time this box is unchecked when loading DICOM data (selecting a single file form a series to open).

I'm not sure I understand your question. I need the box to always be unchecked.

The rest of your explanation is exactly right.

I'm not sure I understand your question. I need the box to always be unchecked.

I'm hoping Steve (or another developer) can answer it :)

I know that Julien F added some code that tries to do the right thing - but in general dicom shouldn't be loaded via the Add Data because that pathway relies on file extensions which aren't a required part of the dicom standard (sometimes they will be .dcm or .ima but sometimes nothing). This may explain what you see with the Single File checkbox.

Instead you should be using the DICOM Module, which looks inside the files to map them to slicer data structures.