Question Kunena has Stopped Working Cannot amend categories etc

When I last checked before XMAS my Kunena forum was working perfectly. This AM I decided to amend a category to allow polls which i know how to do BUT the checkbox wouldn't work and even if i went to the category itself to select polls nothing saves I am getting javascript void error BUT i do not know why this would suddenly happen. In the back end nothing now saves so I cannot change anything
Please advise I have tried to get it to work by disabling JCH

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Joomla! SEF: Enabled | Joomla! SEF rewrite: Enabled | FTP layer: Disabled |

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htaccess: Exists | PHP environment: Max execution time: 30 seconds | Max execution memory: 128M | Max file upload: 8M

Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
347	Forum	topmenu	view=home&defaultmenu=355	forum2	No
355	Forum	kunenamenu	view=home&defaultmenu=357	forum	No
356	Index	kunenamenu	view=category&layout=list	forum/index	No
357	Recent Topics	kunenamenu	view=topics&mode=replies	forum/recent	No
358	New Topic	kunenamenu	view=topic&layout=create	forum/newtopic	No
359	No Replies	kunenamenu	view=topics&mode=noreplies	forum/noreplies	No
360	My Topics	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
361	Profile	kunenamenu	view=user	forum/profile	No
362	Help	kunenamenu	view=misc	forum/help	No
363	Search	kunenamenu	view=search	forum/search	No
364	Forum	topmenu	Itemid=355	kunena-2017-12-18	No

Joomla default template details : protostarplus | author: Maarten Blokdijk | version: 1.0 | creationdate: 04/13/2016

Kunena default template details : Crypsis | author: Kunena Team | version: 5.0.12 | creationdate: 2017-11-24

Kunena template params:

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DefaultCategoryicon
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templatebyText
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Kunena version detailed: Kunena 5.0.12 | 2017-11-24 [ Linsang ]
| Kunena detailed configuration:

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Kunena config settings:
board_offline	0
enablerss	1
threads_per_page	20
messages_per_page	6
messages_per_page_search	15
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| Kunena integration settings:

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Kunena - Finder Disabled
Kunena - AlphaUserPoints Disabled
Kunena - AltaUserPoints Enabled: activity=1 activity_points_limit=0
Kunena - Community Builder Disabled
Kunena - Easyblog Disabled
Kunena - Easyprofile Disabled
Kunena - Easysocial Disabled
Kunena - Gravatar Disabled
Kunena - JomSocial Disabled
Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Disabled

| Joomla! detailed language files installed:

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Joomla! languages installed:
en-GB	English (en-GB)

Third-party components: AltaUserPoints 1.1.11

Third-party SEF components: None

Plugins: None

Modules: None

NB Problem is the same for Chrome and Internet Explorer
All the back end has stopped working. I cannot save anything nor amend anything. I have done a lot of work on this and its very frustrating! What is the solution?
The rest of my joomla components all work fine
I have also cleared chrome cache and IE
Diagnostics show no errors

Now I've also noticed that my avatar does not show on front end logged in or out, but other users avatars do show. None of the images in the posts show up
I also cannot view all categories, alter any details in a category and save or in fact alter and save anything in the kunena backend.

Upgraded to new version 5.0 13 today and now works again !!

We all work in our spare time here. Therefore it's possible that not always someone is here.
I think, your speed optimizer is the problem.