Customizr Slider Image Not Displaying

I have several pages where I use a slider but the image isn’t displaying. Instead it shows a gray box the dimensions of the slider. I’ve tried:

* clearing the cache
* deleting browser history
* deactivating all plug-ins
* reverting to both Customizr and Customizr-Pro instead of our child theme

Nothing I’ve tried has made the image display. The page link is to one such page.

I don’t believe it’s because I only have one image, because in the past one-image sliders have displayed just fine. But I can’t figure out what is causing this.

Any ideas? Thanks!

System info:

# SITE_URL: https://www.ben-hur.com
# HOME_URL: https://www.ben-hur.com
# IS MULTISITE : No

# ACTIVE THEME : Customizr Child Theme 0.1
# PARENT THEME : Customizr Pro 2.1.45
# WP VERSION : 5.3.2
# PERMALINK STRUCTURE : /%postname%/

# ACTIVE PLUGINS :
Akismet Anti-Spam: 4.1.3
API KEY for Google Maps: 1.2.0
Broken Link Checker: 1.11.11
Column Shortcodes: 1.0
Delightful Downloads: 1.6.6
Donorbox Donation Form: 7.1.2
Easy Footnotes: 1.1.4
Envira Gallery Lite: 1.7.7
Google Analytics Dashboard for WP (GADWP): 6.0.2
Login LockDown: v1.8.1
PayPal Donations: 1.9.5
Raw HTML: 1.6.2
Really Simple SSL: 3.2.9
Shortcodes Ultimate: 5.7.0
ShortPixel Image Optimizer: 4.16.1
Social Media and Share Icons (Ultimate Social Media): 2.5.1
The Events Calendar: 5.0.2
UpdraftPlus – Backup/Restore: 1.16.22
Widgets On Pages: 1.4.0
WP Google Search: 1.0.8
WP Super Cache: 1.7.1
Yoast SEO: 13.1

PHP Version: 7.2.24
MySQL Version: 5.7.28-log
Web Server Info: Apache

WordPress Memory Limit: 40MB
PHP Memory Limit: 256M
PHP Upload Max Size: 64M
PHP Post Max Size: 65M
PHP Upload Max Filesize: 64M
PHP Time Limit: 30
PHP Max Input Vars: 1000
PHP Arg Separator: &
PHP Allow URL File Open: Yes
WP_DEBUG: Disabled

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The page I need help with: [log in to see the link]