Comments don't appear after clicking submit

have you tried:

-deactivating ALL plugins (yes, all) temporarily to see if this resolves the problem. If this works, re-activate them individually (one-by-one) to find the problematic plugin(s). If you can’t get into your admin dashboard, try deactivating via FTP or SFTP or whatever file management application your host provides. If applicible, also remember to deactivate any plugins in the mu-plugins folder. The easiest way is to rename that folder to mu-plugins-old.
– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems (because the hooks remain unless plugins completely removed or some plugins stick around in cached files. So by renaming the folder, you break them and force them inactive).
– To rule out any theme-specific issue, try switching to the unedited default theme for a moment using the WP dashboard. If you don’t have access to your admin area, you can switch to the default theme by renaming your current theme’s folder in wp-content/themes and adding “-old” to the end of the folder name using via FTP or SFTP or whatever file management application your host provides.

Hi Tara, I’ve tried this and found that it seems to be the Jetpack plugin. After deactivating the Jetpack plugin comments work. Re-activating makes the problem reappear. So it seems to be a problem connecting to the Jetpack comments system server?

It indicates problem with your jetpack plugin.

This problem has resolved itself today – as I note others have experienced the same problem I can only assume it was due to a problem with the servers that handle Jetpack comments.

Glad to hear that ??