Jerome wrote: ... I need to know the new context.
Hi,
There is no new context here at my end. As I said, everything is the same except it's now HikaMarket 1.6.4. I am still on Joomla 3.4.1 and HikaShop 2.5.0 etc, and in that "clean environment" with nothing else installed and Protostar.
So I could copy and paste my earlier post with the many screenshots here again and only replace "1.6.3" with "1.6.4".
The patch you provided earlier worked in 1.6.3, indeed. It is included in 1.6.4, obviously, but it seems it doesn't do there what it's supposed to do - it is again an issue with the vendor registration form reloading in "virgin state" if a required field is left empty when clicking "Register".
So, while
my context has not changed other than updating to 1.6.4, I guess there is something else that has changed in 1.6.4 which causes the issue to re-appear.
Sorry for the hassle, but there it is.