How is it possible that having two installed JoomSEF online stores with the same configuration and one works and another does not?. (The difference is that the works have an older version of JoomSEF)

How is it possible that when the store stopped working JoomSEF was after an update from JoomSEF?

How is it possible to ask support for a problem caused by Artio nobody will answer you?

Where you can download older versions of JoomSEF and virtuemart extension, they are better than the present?

The URL regalosdecocina.com, the product URLs doesn´t work SEF, why?, i don´t know, i just only update joomsef and virtuemart extension...

Vaya mierda de soporte... la última vez que compro este componente

Llevo 3 años comprándolo para todas mis web, pero es la última vez

Hello, please, before complaining, read the www.artio.net/support-forums/rules

You write no Order ID, no version information, nothing. Why should we answer to you if you do not follow the basic rules?

Most likely, the problem is that the product URL has changed -- and that is likely not due to JoomSEF upgrade but due to VirtueMart upgrade.
You should check the JoomSEF configuration, that the URL filter for the VM extension is not preventing the creating of new SEF URL, as that is most likely the problem.