I reinstalled the plugin. No joy…
I have a bunch of “virtual” products, that are made up of scientific testing on samples. The customer is paying for the testing, so the “product” is the results of the testing (hence “virtual”).
The is an option “Full report and recommendations” which adds an amount per sample to the cost. E.g. and extra $50 per sample.
So for a test @ $99 per sample, 10 samples with full report should be 10 * $149. But it is not adding the extra $50 to the cart price, even though the price per sample goes up on the product page before adding to the cart.
I love that people make free plugins and uphold the sharing of knowledge and experience etc. But, if this plugin is not reliable in a commercial environment then I’ll have to subscribe to something better I guess.