The answer is in this thread…
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Allowable HTML Tags in WordPress Editor

To fix the problem, you’ll need to edit this file wp-includes/kses.php as shown below.

Now, you can override the default filter and add in whatever HTML tags you want. I have also added “class” to the “img” tag and “style” to “span” tag

1. I changed the format of the post title.

2. I changed the post meta.

3. I changed sidebar content.

4. I change the layout of the individual post.

5. I added the Wasabi Related Post plugin code to single.php.

The homepage looks like this…

And the individual post looks like this…

So what do you think?

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If you are interested to use this WordPress/Prologue Modified theme, leave me a comment below.

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You can also download the original Prologue theme here.

You will need to run the MySQL script manually. Instead of…

ALTER TABLE `wp_posts` ADD FULLTEXT `post_related` (
`post_name` ,
`post_content`
)

You can replace ‘wp_posts’ to the database table used by that particular WordPress MU blog, for example, ‘wp_18_posts’.

I have done it for this blog. I used the Peter Bowler’s version of Related Post. It works.

I think it is due to the different database structures between the classic WordPress and WordPress MU. Anyway, I’ll have to look for another related post plugin.