I can wait a few days thanks

Expected to be later today

The pm plugin update with the filter should be available now…

the filter you will want to use is ‘sph_pm_inbox_max_height’…

this will be the max size setting in pixels…

make sure you get pm version 1.5.2… and you will need to update to 5.2.1 first (for other reasons)…

How and where do I use this “sph_pm_inbox_max_height” filter?

filters work just like any other wp filter, hook or action…

for simplicity here, lets add this to your spFunctions.php file…

add_filter('sph_pm_inbox_max_height', 'my_pm_height_control');
function my_pm_height_control($height) {
    $height = 600;
    return $height;
}

just change the 600 to whatever you want… this will set a fixed height for all users… please be advised this will override/ignore any personal setting users make in their profile…