Did you do any server updates like PHP or your web server? I wonder if dependence like that could be the cause of the issue.

Fresh install ... no change.

Longer version: I downloaded the complete version of 1.7-rc4, moved config/config.inc.php.sample to config/config.inc.php and set my db and smtp config parameters. I still have the same problem of headers not being shown on initial load of new messages.

What the heck could have happened???

I downloaded the complete package and ran the bin/installto.sh command, as per the upgrade instructions:

cd <the-unpacked-roundcube-directory>
bin/installto.sh <your-existing-roundcube-directory>
I will try a fresh install today and see if that fixes. Will report back.

When you updated Roundcube did you replace all the skin files? Did you install from the complete download or dependent version?

Good ideas, thank you for the suggestions.

Unfortunately I see the same behavior in Microsoft Edge, Google Chrome, and Firefox, all at latest version. No JS errors in the browser console.

Have you tried using another browser? Is there any errors in the browsers JS console?

Well, not fixed after all. Back to investigating. If anyone has any ideas for what to try I'm all ears!

This issue is now fixed.

For anyone else that comes across this, removing all files in the rouncubemail/temp/ directory fixed the issue:

rm -f rouncubemail/temp/*

Roundcube is open source webmail software it is not a service. It connects to your IMAP server similar to how Outlook does. The error you describe sounds a bit strange but Roundcube has is not involved at all when you are using Outlook. I suggest you contact your email provider and tell them the exact error message you get. They might ask you for the IMAP connection details you are using to confirm they are correct as well.

Hello - how are you? I don't know if anyone can help, and please forgive me - I'm not particularly savvy when it comes to these things!

I am able to access my webmail via roundcube on my main PC via a browser, and also via Outlook on the same PC. However, using the same credentials I am unable to access my mail from any other device, phone - tablet - other PC, the login always fails. It fails when logging in via the roundcube login page OR trying to login via outlook or any other email client.

Is this a 'roundcube' issue or an I barking up the wrong tree?

Any advice appreciated.

Thanks in advance!