Question attachment image size exceed limit allowed by configuration

I know this issue seems to recur, and have tried what I can.
I've made sure that the avatar image max size and the file upload max size , and the image upload size are all identical.
I have checked my main menu link to the forum id of type menu item alias


I would be grateful please for a pointer what to try next.

Thank you

Database collation check: The collation of your table fields are correct

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htaccess: Missing | PHP environment: Max execution time: 600 seconds | Max execution memory: -1 | Max file upload: 100M

Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
160	Forum	kunenamenu	view=home&defaultmenu=162	forum	No
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162	Recent Topics	kunenamenu	view=topics&mode=replies	forum/recent	No
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185	test	mainmenu	view=category&layout=list&catid=0	test	Yes
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230	Kunena Help	kunenamenu	view=misc	kunena-help	No

Joomla default template details : purity_III | author: JoomlArt.com | version: 1.1.6 | creationdate: April 2016

Kunena default template details : Blue Eagle5 | author: Kunena Team | version: 1.0.3 | creationdate: 2017-02-04

Kunena template params:

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Kunena version detailed: Kunena 5.0.13 | 2017-12-31 [ Meerkat ]
| Kunena detailed configuration:

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Kunena config settings:
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| Kunena integration settings:

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Kunena - Finder Disabled
Kunena - AlphaUserPoints Disabled
Kunena - AltaUserPoints Disabled
Kunena - Community Builder Enabled: access=1 login=1 activity=1 avatar=1 profile=1 private=1
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: CommunityBuilder 2.1.3

Third-party SEF components: None

Plugins: None

Modules: None

Still struggling with this issue - grateful for any help please
Am trying to run the update to K5.1 but having problems with that as well "invalid extension update" (separate topic created)
I'm hoping that maybe when the second of these issues is solved the first issue will go away as well!