Hi guys,
I see that I still owe you an answer :)
The fact that in Joomla Edit Article a row of tabs is missing, is due to a double load of jQuery UI, when J2Store is being implemented, while the website uses the Helix Ultimate 2.x template.
The solution, given by J2Store helpdesk is:
Because we load jQuery UI and Helix Ultimate Framework also loads jQuery UI hence the conflict is caused.
Solution: Navigate to J2Store -> Configuration -> Basic settings tab-> Load JQuery Ui -> set to NO.
So this is a J2Store item rather then a Helix Ultimate item.
Kind regards,
Edze de Boer