Hi, BWTR. I have not tried it, but the word from the Carrara forum at DAZ is that you cannot bend M4's shoulders (in Carrara)  beyond the centerline of the body without ERC issues.
Full disclosure: I do not know what ERC means.   : )
Some users at the DAZ forum have expressed great distress. I have plenty to keep me busy with other renders until the C7 fix is out, but I do like the appearance of this character and its morphs.
For now, I trust the DAZ people to deliver some enhancements with C7, as opposed to only bug fixes. (But I want the fixes, too!) We shall see...