It now appears to me that I should have posted the problem here in order to get a response, so I am doing so. If I need to re-state the problem here or should not have re-posted it here please let me know.
Brief summary:
The example using OPTIONINDEX in the Knowledge Center article http://help.sketchup.com/en/article/1145642 (Implement dynamic pricing) doesn’t work properly for me (SU 2015, Windows 7 64 bit, IE 11 update version 11.0.17); OPTIONINDEX appears to return the value for the previous entry instead of the current one…