We are still trying to resolve this issue. Rolling back to 7.6.46 helped to a degree, but it is still occurring.
Hi @sophie,
We're getting lots of spam so sometimes your posts could be put under moderation automatically by the forum system. It doesn't mean we have blocked you. Please be patient and your post will be approved. Also we remove the duplicated topics and posts, it's hard to follow the same issue and support in different topics if the problem is the same.
Please do not contact us via a email address for plugin bugs or troubleshooting, the email support is for other issues. All wpDiscuz support specialists are here, we try to reply as soon as possible.
Regarding to the nonce issue:
We have release two updates during last few days so please make sure you use the latest version. Then please delete all plugins caches and make sure you've deleted your server side caches. For example WP Engine hosting service has backend cache in the website management dashboard that also need to be purchased, it depends on your hosting.
The nonce issue can also happen if your page is opened too long. This is the main reason why the nonce has been created by WordPress. I mean it has expiration period and if you keep the page opened for long time you'll get such problem as well.
We still check the cases and work on the plugin to cover all them, it seems there are multiple reason of this problem and we've already solved 99% of them. It's become very complex to find the rare cases. I think one of the rare case is yours. So please make sure the plugin is updated to the latest version and all kind of caches are deleted, then please share some URL where we can check it.