I don’t know if its bad form to reply to myself before anyone else does, but…
I found a similar problem in another post, where it was a secondary issue (OPTIONLABEL(“material”) shows “delay”) to primary issue of OPTIONLABEL(“LenZ”) not working: OPTIONLABEL fails for LenZ .
However, the fix there (as I understand it, using an intermediate variable) appears to solve my problem also: optionindex_function_delay_workaround.skp (540.8 KB) .
I assume this has something to do with “order of calculation”, & would still like a more elegant fix if anyone finds one.
James