Hello All,
I am having a similar issue. I cannot save any product prices whatsoever. I know the database is communicating because if i change in phpmyadmin it reflects in backend and frontend. However, whenever i try to save from administrator nothing happens. I have fixed shopper group to NULL as it was all messed up after an update. My main reason for trying to figure this out is because I believe it is related to my issue of when you try to visit the cart I get this error:
Fatal error: Call to undefined method VirtueMartModelProduct::getProductPrices() in /com_virtuemart/helpers/cart.php on line 1288
After the update to 2.0.18 then downgrade to 2.0.16 because of major issues we arent even operational anymore. Entire site is basically useless.