There are two beneficiaries, and I entered 50.0 & 50.0 in their respective Other Long Term boxes. The capital loss is a carryover from prior years; there is no current year capital gain or loss. I tried entering 25.0 & 25.0 in both their Required and Other long term boxes, as I know sometimes that works, but it didn't clear the diagnostic either.
finally figured it out... you were right, I had overridden a box on a different screen trying to get it to work, but when I took that override out then it worked with the 50% in all the Other boxes. Thanks!