It was just brought to my attention that images can't be posted due to the following error:

 

 

Any ideas what's going on with that and how to correct the issue?

In the first instance, please update your site to the latest release and test this again. However I would say, that appears to be coming from imagemagick on your server.

9 hours ago, Marc Stridgen said:

In the first instance, please update your site to the latest release and test this again. However I would say, that appears to be coming from imagemagick on your server.

Thanks, whatever it was, it seems to have resolved itself overnight. 

Glad to hear things are working again.