Backend tabs not showing

[Nilsy]

I have no clue. I am at on holidays actually. I am sure the reason is some non joomla plugin, which creates this problem. You could install a fresh vm somewhere, or just use our demo.virtuemart.net and compare the loaded scripts.

the answer is completely correct...

How can anyone except you know for certain what is installed on YOUR site?

"I am sure the reason is some non joomla plugin" - correct

"compare the loaded scripts" - correct

Conflicts are very difficult to find on any install without having complete access and control of that install..

I know this is technically correct...
When you contact tech support, after years of paying (even from the years of just donation), you just don't expect support answering in this way "I have no clue".
As I said, made me laugh...

[razor7]

Thanks a lot! downgrading SIGPro solved the issue for me too!

[Meisseli]

I can confirm this (J 3.9.1. / Vm 3.4.2 / PHP 7.0.32) . Any solution? Anyone tried Simple Image Gallery 3.6.x versions?

[GJC Web Design]

please use the search...

http://forum.virtuemart.net/index.php?topic=141736.msg499833#msg499833

[Studio 42]

@Nilsy, some plugins add own javascript in other component, most are system plugin and the only solution is to  disable all suspected extension and see if it work.
Sometime Jquery is reloaded or fancybox or jquery.ui . The only way to debug this is to have access to the console and find the guilty.
When you have a blank page, the problem is same, It can be an obsolete extension or bugged plugin.
So the answer "I have no clue" is poor but right because it's not possible to get an answer without any error report.