500 Error
Hi, I've tried everything to troubleshoot this error and no luck.
My regular post grids are working (except for custom taxonomy below), but I get an HTTP Error 500 on the page that displays my filterable post grid : https://x-libris.xf-redux.com/lengths/
I cloned the post grid used on that page. When I changed it to standard it showed a post grid (with no filters etc). When I changed it to collapsible to see what happened I got an empty page: https://x-libris.xf-redux.com/test1/
The lengths page was working from 28 April when I created it, until I recently updated the plugin.
Custom taxonomy: when I originally set up the post grids they had a custom taxonomy displayed. This no longer shows due to a php error. The option to select a custom taxonomy for the old post grid is no longer there, I only have "general" options. I tried setting up a custom taxonomy under "advance > taxonomy and terms" in the new tax grid and it doesn't display. I can't find any instructions for Elements - advance to see if I've done something wrong. The error I'm getting is:
ltrim() expects parameter 1 to be string, object given
Plugin: post-grid-pro
wp-includes/formatting.php:4313
ltrim()
wp-includes/formatting.php:4313
esc_url()
wp-includes/formatting.php:4414
esc_url_raw()
wp-content/plugins/post-grid-pro/includes/layout-elements.php:634
post_grid_layout_element_custom_taxonomy()
wp-includes/class-wp-hook.php:287
do_action('post_grid_layout_element_custom_taxonomy')
wp-content/plugins/post-grid/templates/post-grid-hook.php:516
post_grid_item_layout_content()
wp-includes/class-wp-hook.php:287
do_action('post_grid_item_layout')
wp-content/plugins/post-grid/templates/post-grid-hook.php:403
post_grid_loop()
wp-includes/class-wp-hook.php:287
do_action('post_grid_loop')
wp-content/plugins/post-grid/templates/post-grid-hook.php:299
post_grid_posts_loop()
wp-includes/class-wp-hook.php:287
do_action('post_grid_container')
wp-content/plugins/post-grid/templates/post-grid-hook.php:75
post_grid_main_container()
wp-includes/class-wp-hook.php:287
do_action('post_grid_main')
wp-content/plugins/post-grid/includes/classes/class-shortcodes.php:36
class_post_grid_shortcodes->post_grid_new_display()
wp-includes/shortcodes.php:343do_shortcode_tag()
Unknown location
preg_replace_callback()
wp-includes/shortcodes.php:218
do_shortcode()
wp-includes/class-wp-hook.php:287
apply_filters('the_content')
wp-includes/post-template.php:253
the_content()
wp-content/themes/twentysixteen/template-parts/content-page.php:20
load_template('wp-content/themes/twentysixteen/template-parts/content-page.php')
wp-includes/template.php:672
locate_template()
wp-includes/general-template.php:168
get_template_part('template-parts/content','page')
wp-content/themes/twentysixteen/page.php:24
thanks

Please send me a temporary admin access on your site, i will take a look on this issue. please send me mail to support@pickplugins.com with login info.
also please enable debug and debug log on your site and see the error message on log file when this issue is happening.