I've been using webmin/virtualmin happily for some time. I moved servers a few weeks ago and everything went really well. Has been working fine since then.
But today, when checking email, the usermin inbox went nuts. Basically it doesn't display emails any more, but just a row of special characters.
I've attached a screenshot.
It's not browser or device specific as I've tried it on Nexus and Mac and get the same results.
The emails are all still there and accesible through virtualmin > email settings > click on email inbox mail file
All the other mail folders e.g. Sent mail, Drafts, etc. still work.
And now, weirdly enough, the issue seems to have cleared by itself, but it took about an hour to do so.
Any idea what it was/could be/how I might avoid it in future? I do have a couple of thousand emails stored on the server, but the email disk quota is double the used amount. Any ideas?