Solved Getting com-kunena-trash-manager in my SEF URL for the blog

That is the procedure. Unpublish and Trash/Empty Trash the Kunena menu using Joomlas Menu options. Then use Kunena's Create Menu feature to recreate the menu to its default settings.

See if that works and then report back the results please.

OK, I did that, following the VERY VERY helpful Youtube video showing exactly how to do it...

However, it only changed my issue slightly. Now all my forum menu items have links like this:

csyowners.com/index.php/com-kunena-configuration/forum/index

instead of what was originally there:

csyowners.com/index.php/forum/index

How do I configure it so that the 'com-kunena-configuration' isn't in the URL?

Attached are screen shots of the Joomla Menu Config pages for the Forum

I am sorry that no-one has run to your assistance with advice that will help you. I don't have a guaranteed answer for you except to suggest that you trash-and-burn all menu items that relate, in some way, to Kunena before you attempt to restore the default Kunena menu.

By "trash-and-burn" I mean to trash the menu items and then empty the menu trash; permanently delete the items from your site. The technique is explained (a little) on our FAQs page.

The next part of your problem - your pages links look like domain-name/index.php/forum/index - is actually related to your original problem. My suspicion is that it's tied-in with how you've implemented SEO. I am sure we've discussed this in the past. The main point that we need to make is that this is not, strictly-speaking, a Kunena issue as it is essentially a Joomla-related matter resulting from how you've set things up on your website before you installed Kunena.

I think this topic may have the help that you are looking for: How do I change the URL of my forum?

I am assuming that, because K 3.0.3 has been released and supersedes K 3.0.2 and since we have received no follow-up to this topic for a long time, this topic has been resolved. Accordingly I am marking this topic as "resolved".

Actually I think I have seen this before: corrupted menu table in Joomla.

Rebuilding menus from menu manager sometimes helps to solve this issue.

Sorry I haven't come back to report back, but I DID report back that I had tried the procedure suggested for corrupted menu items, which I completed very carefully, and it did change the URL, but not completely fix the problem.

It only changed my issue slightly. Now all my forum menu items have links like this:

csyowners.com/index.php/com-kunena-configuration/forum/index

instead of what was originally there:

csyowners.com/index.php/forum/index

How do I configure it so that the 'com-kunena-configuration' isn't in the URL?