I have experienced this and have yet to pinpoint what’s happening. I did manage this workaround once to make the chart.:
-When this occurred, I immediately clicked upon the Person block, chose another name in the RootsMagic Explorer index, generated their chart and immediately returned to the messed up individual and generated a second time. It appeared to display correctly then.
But it doesn’t work everytime:
Okay, this just above screenshot was at default Descendant Generations. If I change that to 0 or 1 generations, I get just Horatio (they have no children):
BUT when set to 2 and above… it overwrites his wife onto his box graphic.
Ok, going back to Milton way above, if I get the squashed/jumbled chart... changing the generations lower from default and clicking Generate brings the boxes back. There's something going on with the Generations setting, for sure.