Did not get white screen, but all site formatting was disabled, along with the wordpress admin bar. Just updated to Version 1.7.7 and no difference.
Here’s screenshots:
ON – https://www.dropbox.com/s/e777vn4i4nugyo4/mg-popup-on.png?dl=0
OFF – https://www.dropbox.com/s/29qmmuuokitq7ld/mg-popup-off.png?dl=0
site is: https://murrayguari.com/
here’s system info from your plugin:
### Begin System Info ###
— Site Info
Site URL: https://murrayguari.com
Home URL: https://murrayguari.com
Multisite: No
— Hosting Provider
Host: DBH: h71a3245485155.db.3245485.hostedresource.com:3313, SRV: murrayguari.com
— User Browser
Platform: Apple
Browser Name: Chrome
Browser Version: 64.0.3282.186
User Agent String: Mozilla/5.0 (Macintosh; Intel Ma
c OS X 10_11_6) AppleWebKit/537.
36 (KHTML, like Gecko) Chrome/64
.0.3282.186 Safari/537.36
— WordPress Configuration
Version: 4.9.4
Language: en_US
Permalink Structure: /%postname%/
Active Theme: murray guari 1.0
Show On Front: page
Page On Front: Home (#3563)
Page For Posts: Unset
Remote Post: wp_remote_post() works
Table Prefix: Length: 14 Status: Acceptable
WP_DEBUG: Disabled
Memory Limit: 40M
Registered Post Stati: publish, future, draft, pending, private, trash, auto-draft, inherit
— Popup Maker Configuration
Version: 1.7.7
Upgraded From: None
— Must-Use Plugins
System Plugin: 3.7.4
— WordPress Active Plugins
Akismet Anti-Spam: 4.0.3
Beaver Builder Plugin (Pro Version): 2.0.6.1
Contact Form 7: 5.0.1
Duplicate Post: 3.2.1
Falconiform YouTube Widget: 1.0.1
Google Analytics for WordPress by MonsterInsights: 7.0.4
Imsanity: 2.3.10
Logos Showcase: 1.7
MainWP Child: 3.4.6
Popup Maker: 1.7.7
Recent Posts Widget Extended: 0.9.9.7
Ultimate Addon for Beaver Builder: 1.6.9
Video Thumbnails: 2.12.3
Wordfence Security: 7.1.0
Yoast SEO: 7.0.3
— WordPress Inactive Plugins
Regenerate Thumbnails: 3.0.2
Search Engine Visibility: 0.5
Sidekick: 2.6.8
WP101 Video Tutorials: 0.3
— Webserver Configuration
PHP Version: 5.6.30
MySQL Version: 5.6.32
Webserver Info: Apache
— PHP Configuration
Memory Limit: 256M
Upload Max Size: 64M
Post Max Size: 65M
Upload Max Filesize: 64M
Time Limit: 30
Max Input Vars: 1000
Display Errors: On (off)
— PHP Extensions
cURL: Supported
fsockopen: Supported
SOAP Client: Installed
Suhosin: Not Installed
— Session Configuration
Session: Disabled
### End System Info ###