I have noticed that sometimes having composed a new discussion or a comment to an existing one that some or all of the content is missing.
When all my text disappears it usually reports 'Body required'. This is very frustrating and I now always copy the content to my clipboard before posting. Clicking on the button at the right hand side of the toolbar '<>' which toggles between 'rich text' and 'source' shows that there is nothing in 'source'.
If I now paste the clipboard everything is as it should be. There seems to be a bug when composing in the 'rich text' window!