dear Viart,
I noticed that the VAT module is not configured correctly by default. In general, (for EU sales), there are 3 rules that apply to VAT.
1. sales to a customer in own country> apply vat
2. Customers in other country but within EU > apply VAT except when you have there VAT number, in that case they are exempt.
3. customers in other countries outside EU > apply VAT unless there are specific treaties between natyions that exempt people from paying VAT.
 
For 3. the responsibility for claiming back VAT is for the customer, so VAT should be applied to all countries by default, except when they fill out their VAT number, for which you have a special module. (see manual)
 
Could you please advise me what I can do to turn back the old 3.3.2 taxation rules (which were correct) in 3.3.34?