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-                      v57
+                      v58
 Add more writes to make certain. Also write out all other pertinent scalars.
+OK well all inputs to this routine are identical (or should be overwritten) and the scalars are indeed OK and teh neuler condition is false as expected. But what we've missed is a call
+to "div_cur" lurking in amongst the apparently benign code. This hides a multitude of horrific possibilities since it does calculations of its own and potentially calls at least 4 other
+subroutines which can modify hdivn with a myriad of other arrays and scalars which are completely invisible. So as usual, having spent days narrowing things down to one or two particular arrays
+the whole thing just explodes in our face again with dozens of other potential sources of trouble.