Hello Guys,
Thanks for reaching out. And sorry for the frustration this issue may have caused you.
White screens can be caused by many different factors.
1 – Memory limit is one which is pretty common.
Solution: https://support.mailpoet.com/knowledgebase/allocated-memory-size-issue/
2 – An error occurring while WordPress is updating the plugin leaving some files missing and creating a fatal error.
Fatal error: Call to a member function getValue() on a non-object…
Solution: delete our plugin using your FTP access and install it again.
If it still doesn’t work, install the plugin through your FTP access directly, so you make sure that all of the files will be on your site.
3 – In our latest release an issue some of you may be facing is related to a bug we’ve introduced in our update class. This is a contextual bug which will happen only when some plugins are installed and activated on your WordPress’ site. For example it will happen with the plugin wp-seo.
Solution: wait for the 2.6.3 version soon to be released or delete the wysija-newsletters plugin from your site using your FTP and install again the version 2.6.2 which has just been patched and should fix that issue.
https://plugins.trac.www.ads-software.com/changeset/886712
Finally for a better more adapted support I recommend you to get in touch with us directly here:
https://support.mailpoet.com/feedback/
Cheers,
Ben