Page editing not working

In approx. 90 % of the time, when I try to edit a page with Nimble, I cannot select my existing sections, and cannot add new ones. The “section containers” (with the + buttons ect.) simply don’t show up.
When adding a new, empty page, I also cannot add any sections. When double-clicking a module, I get the error message “You first need to click on a target ( with a + icon ) in the preview.”. The problem is as stated above: There are no + icons anywhere to be found.

Additionally, the section navigator renders empty, even though there are multiple sections on the page.

Again: From time to time, it works again, most of the time it doesn’t. This renders this plugin completely useless for me.

Begin System Info (Generated 2024-12-06 17:49:01)

------------ SITE INFO
Site URL: xxx
Home URL: xxx
Multisite: No

------------ USER BROWSER
Platform: Apple
Browser Name: Firefox
Browser Version: 132.0

------------ WORDPRESS CONFIG
WP Version: 6.7.1
Language: de_DE
Permalink Structure: /%postname%/
Active Theme: Customizr 4.4.23
Show On Front: page
Page On Front: Home (#2)
Page For Posts: Unset
ABSPATH: /home/www/wordpress/
WP_DEBUG: Disabled
WP Memory Limit: 40MB

------------ NIMBLE CONFIGURATION
Version: 3.3.6
Upgraded From: 3.3.4
Started With: 3.3.2

------------ MU PLUGINS
Health Check Troubleshooting Mode: 1.9.2
NinjaFirewall WP (mu-plugin): 1.0

------------ WP ACTIVE PLUGINS
Classic Editor: 1.6.7
Collapse-O-Matic: 1.8.5.7
Cookie Notice & Compliance for GDPR / CCPA: 2.5.4
Duplicate Page: 4.5.4
FooBox Image Lightbox: 2.7.33
FooGallery: 2.4.27
Health Check & Troubleshooting: 1.7.1
Imagify: 2.2.3.2
Nimble Page Builder: 3.3.6
NinjaFirewall (WP Edition): 4.7
Page scroll to id: 1.7.9
Password Protected: 2.7.5
UpdraftPlus - Backup/Restore: 1.24.11
WP Activity Log: 5.2.2
WP Mail SMTP: 4.2.0

------------ WP INACTIVE PLUGINS
Getwid: 2.0.13

------------ WEBSERVER CONFIG
PHP Version: 8.1.30
MySQL Version: 10.11.4
Webserver Info: Apache
Write/Read permissions: OK

------------ PHP CONFIG
Memory Limit: 256M
Upload Max Size: 150M
Post Max Size: 150M
Upload Max Filesize: 150M
Time Limit: 30
Max Input Vars: 1000
Display Errors: N/A
PHP Arg Separator: &
PHP Allow URL File Open: 1 End System Info

My WordPress installation is up-to-date.
So are Customizr and Nimble. However, I tried downgrades for both, but without success.

I don’t have any cache plugins installed.
I disabled all plugins except Nimble, but without success.

I used three different browsers (Firefox, Chrome, Safari), and cleared the browsers caches, but without success.

I activated the WordPress 2025 theme, but without success.

Some of the JS error logs:

<Preview => error when storing the skope_id>
ccat-sek-preview.js?ver=1733504138:2797 TypeError: Cannot read properties of undefined (reading 'skope_id')
    at i.initialize (ccat-sek-preview.js?ver=1733504138:14:111)
    at o.Class (customize-base.min.js?ver=6.7.1:2:571)
    at new i (customize-base.min.js?ver=6.7.1:2:180)
    at i.<anonymous> (ccat-sek-preview.js?ver=1733504138:2942:42)
    at c (jquery.min.js?ver=3.7.1:2:25304)
    at Object.fireWith (jquery.min.js?ver=3.7.1:2:26053)
    at i.trigger (customize-base.min.js?ver=6.7.1:2:994)
    at i.receive (customize-base.min.js?ver=6.7.1:2:6534)
    at dispatch (jquery.min.js?ver=3.7.1:2:40035)
    at v.handle (jquery.min.js?ver=3.7.1:2:38006)
ccat-sek-preview.js?ver=1733504138:2798  </Preview => error when storing the skope_id>

load-scripts.php?c=0…m-ready&ver=6.7.1:2 The specified value "" does not conform to the required format.  The format is "#rrggbb" where rr, gg, bb are two-digit hexadecimal numbers.

_0_ccat_czr-base-fmk…js?ver=1733504137:1  <api.CZRBaseControl::getSavedModules : the module czr_social_module in control tc_theme_options[tc_social_links] has no mod_opt defined while it should.>
_0_ccat_czr-base-fmk…js?ver=1733504137:1  <api.CZRBaseControl::getSavedModules : the module czr_social_module in control tc_theme_options[tc_social_links] has no mod_opt defined while it should.>
9
Chrome is moving towards a new experience that allows users to choose to browse without third-party cookies.

load-scripts.php?c=0…m-ready&ver=6.7.1:2 An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing.
/leistungen/?customi…channel=preview-0:1 An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing.