I'm home finally.
Did you try to export it using one of these save options?
There is another option too under the Save As> Support Asset > Save Modified Assets.
I have looked at those "deprecated" export options, but found none that refers to morphs. That "Save Modified Assets" sounds promising, though. I will give it a try. Let's hope it's not only for TriAx. ^^
Also, helper's shouldn't get unhooked when saving out as TriAx if you perhaps uncheck the "Override Existing" under the Morph Targets option... Worth a try...
The head is being loaded directly as a CR2 from Poser Formats. This works because the head doesn't use any weight maps, which makes it compatible with DS at native mode. First time I save the head, DS populates the data folder with all existing morphs, and everything works, including the ERC master dials. The problem is when I need to edit a morph, I've found no way to save individual morphs, and resaving the head no longer saves any morphs.
I am not using the Transfer Utility because it messes up all the morphs - same results as converting the head to TriAx, and I also loose all the morph groups, and range limits. But if I get this right, "override existing" wouldn't affect anything if I loaded the OBJ and transferred the morphs from the Poser version, since bare OBJs have no morphs to start with - there would be nothing to override.
Conversely, if I use the Transfer Utility to copy only the fixed Poser morphs to the DS version, if I disable "override existing", I guess the whole thing would do nothing, since the morph already exists with the same name, and I would be telling DS not to touch it, right? I will have to check that, but in my previous experiences, the Transfer Utility doesn't work with Poser master dial hook ups.