open custom module in modules manager
all tabs should be visible:
[Module] [Menu Assignment] [Module Permissions] [Options] [Advanced]
Only one tab shown (and configuarble):
[Module]
Joomla! 3.7.0-beta3 Beta [ Amani ] 21-February-2017 15:03 GMT
MySQL: 5.7.17-0ubuntu0.16.04.1
PHP: 5.6.30-7+deb.sury.org~xenial+1
Apache: Apache/2.4.18 (Ubuntu)
Can't confirm either. Looks like you have customised your site (looking at the editor buttons)
Status | New | ⇒ | Closed |
Closed_Date | 0000-00-00 00:00:00 | ⇒ | 2017-03-13 09:34:25 |
Closed_By | ⇒ | Ruud68 |
Thnx @infograf768 started switching off editorxtd plugins and it turned out that the culprit was in the advpoll plugin.
Will take this up with the developer of this component.
Sorry for the 'false-positive'.
Keep up the good work!
Hi Ruud,
Your help has been magnificent. The problem was caused by the "ADVPoll" plugin. I have disabled this plugin and the problem has been resolved.
Thank you very much.
Regards.
Your welcome :)
Can't confirm:

System information (as much as possible)
Joomla! 3.7.0-rc1
macOS Sierra, 10.12.3
Firefox 52.0 (64-bit)
MAMP 4.1.1