Hello,
I deleted the variants it had and it still worked fine. Everything was ok until I created a new characteristic and added 1 variant. Then the UPS plugin would not show again - even deleting the variariant/characteristic did not make it come back - I am back where I started
Can you show me how you configured your Product and its variants through some screenshots so that we can have more information about it ?
I don't think that your "Joomla Update" and UPS issue are connected, the UPS problem is only coming from the way UPS read and send your product/variant data to the UPS platform. Also, note that using the "Group package" option will probably be a good idea regarding your pricing issue.