Shamim's Plugins

if your php version 5.3+ add following code in you theme’s (child theme’s if any) functions.php

add_filter( 'fep_filter_display_participants', function(){
	$participants = get_post_meta( get_the_ID(), '_participants' );
	return implode( ', ', $participants );
	
});

this will show user id (as you suggested) in participants list.

Please check now.

Sorry for the inconvenience.
Did you update from any previous version? If yes, from which version?
Please let me know your php, mysql and wordpress version.

Give me admin access of your website and ftp access so that i can try.

Regards
Shamim

Are you updating from any previous version? Is it showing this error after update or all of a sudden?
Version 4.8 is stable and tested with wordpress version 4.4+ without any issue.
Can you please try again now?
Let me know.

Please go to front-end-pm-pro/pro/includes/class-fep-email-beautify.php line around 235 add $content['message'] = wpautop( $content['message'] ); just before return $content; line.

Let me know.

We are working for better email template system. we hope next version we will be able to introduce that.

Do you comfort to change php code? Let me know. Otherwise give me access to your website so that i can change some code of this plugin

Thank you for contacting.
Can you please give me what you got when reply?

Thank you for contacting.
I am happy to refund as long as it covers by refund policy. Please read again our terms and conditions https://www.shamimsplugins.com/terms-and-conditions/

Answer of your question
1. wordpress tables are highly optimized and we can use all core functions for those tables. You can google, you will find hundreds of reasons to use wp table.
bbPress uses wp tables. wordpress.org use bbPress as their support forum. Do you think you have more users and more messages then that support forum?
2. it is always better to use equal ( = ) query then LIKE query. we can easily use equal query if we use duplicate meta_key. Also wordpress support duplicate meta_key. So if your custom coded message plugin shows error for this i think you should change code of that plugin so that it does not show error.

Best regards
Shamim