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Missed this...
i will give a check asap, sorry the little :o delay on answer (just some months now!), will be fixed very sooooon!

Ps: [b]just checked before 2.4.6 release and all is working fine here[/b] about this. If still in trouble just let know.

Sorry, I just realized that the attachments did not go through. See attachment included here.

Hello!
I have installed this plugin and the logins appears to be working great! Now, I'm trying to use this last topic with images shortcode, but when I try to update my page I get the following error message:
"Updating Failed. The response in not a valid JSON response."

(see attached image)
Am I entering the shortcode incorrectly?

A simple and basic working example result to view is here:
[size=120][b][url=https://www.axew3.com/w3/phpbb-grid-list-of-latest-topics-with-attachments/]phpBB grid list in WordPress: latest topics with images attachments[/url][/b][/size]

[w3allastopicswithimage cat_id="1" topics_number="6" post_text="1" text_words="30" columns_number="2" gap_columns="5"]

[w3allastopicswithimage cat_id="1" topics_number="6" columns_number="2" gap_columns="10"]

<table><tbody>
<tr><td>...</td> <td>spacer</td> <td>...</td></tr>
<tr><td>...</td> <td>spacer</td> <td>...</td></tr>
etc ...
</tbody></table>

<tr><td>...</td> <td>spacer</td> <td>...</td> <td>spacer</td>  <td>...</td></tr>

[size=150][b]How it work[/b][/size]
Suppose there are forums with [b]ID-5 and ID-9[/b], that are sub-forums and belongs to the Forum Category with [b]ID-1[/b].
Then will be retrieved all latest updated topics from forums with ID-5 and ID-9, [b]that will contain ALMOST one attachment into any of their posts.[/b] ONLY the first inserted attachment will be retrieved to be used and will display for the post/topic into the WordPress [i]w3allastopicswithimage[/i] shortcode.
[b]The shortcode to use is like this:[/b]
[code][w3allastopicswithimage cat_id="1" topics_number="6" post_text="1" text_words="30" columns_number="2" gap_columns="5"][/code]
[b]and will produce this result:[/b]
Retrieve all latest topics from sub forums which [b]belongs to the specified Forum Cat with ID 1[/b]
Retrieve last 6 updated topics/posts
With post text
With 30 words
In two columns
With gap space between columns of 5 (after calculated in %)

[b]or without post text[/b]
[code][w3allastopicswithimage cat_id="1" topics_number="6" columns_number="2" gap_columns="10"][/code]
The [b][i]columns_number[/i][/b] param is useful to show more columns per row, [b]minimum 2[/b]. If omitted, 2 by default.
The [i][b]gap_columns[/b][/i] param is an int value that is calculated after in %, if omitted the value will be 0 (0%).

[b]the topic need to have almost an attachment or will not be retrieved[/b]: the query search for all latest updated topics WITH ALMOST ONE ATTACHMENT ON HIS POSTS. Only the first attachment added into the topic will be retrieved to be used as image to display into the WP shortcode output. The attach can be added into any post, BUT ONLY THE ONE THAT WILL RESULT AS THE FIRST ONE ATTACHED ([b]based on related attachments [i]time[/i] value[/b]) will be retrieved to display. That so, could be inserted into any of topic's posts and not only into the first.

the query will return any kind of attach that is the first (time based) inserted on topic. If the first attach that belong to the topic isn't an image, then the link to download the file will display.

This is a raw version that show how to achieve the result, but could be coded in several different ways, especially about the output. The output grid is done by using an html table that look like this if two columns:

[code]<table><tbody>
<tr><td>...</td> <td>spacer</td> <td>...</td></tr>
<tr><td>...</td> <td>spacer</td> <td>...</td></tr>
etc ...
</tbody></table>[/code]
three columns will be:
[code]<tr><td>...</td> <td>spacer</td> <td>...</td> <td>spacer</td> <td>...</td></tr>[/code]
and so on ...
[color=#BF0000][b]READ[/b][/color] inline hints on file
[i]views/[b]phpbb_last_topics_withimage_output_shortcode.php[/b][/i]


This shortcode not implement avatars (so [i]phpbb_last_topics_withimage_output_shortcode.php[/i] is more easy to be edited for own use).
While option
[b][i]Retrieve posts on Last Topics Widget based on phpBB user's permissions[/i][/b]
affect, if active option into WP_w3all plugin admin config page.
To edit the output and style the shortcode output, see file:
[i]views/[b]phpbb_last_topics_withimage_output_shortcode.php[/b][/i]

NOTE: like others [i]shortcodes[/i] files that reside into plugin's [i]views[/i] folder, you can activate the option
[b]Use custom files to display Last Topics Widgets, Login Widget or Last Topics Shortcode content[/b]
in [i]WP_w3all admin config page[/i] and copy/paste this file into the custom folder
[i]/wp-content/plugins/wp-w3all-config[/i]
so custom modifications done into these files, aren't overwritten when plugin update.