Important: the product lines disappear in quotes

Upgrading to 7.1.5 and when editing a quote the product lines disappear. Is it a grave error of the update? :woohoo: :S

I just found this link which deals with the same problem, but no solution:

https://suitecrm.com/forum/installation-upgrade-help/3519-invoices-and-quotes-are-broken-following-7-1-5-upgrade