I use Chrome and have never had that happen (yet).
Lately I have been trying to insert images (thx for teaching me MagicDave) and when I hit submit the images do not always go thru and in a few instances I then see the previous messages "image" instead of the one I just inserted !! (I remember that you have made this same observation in the past) Also, images are being 'scanned' for virus' before being displayed and this I feel is a actually good thing. Although too late for myself if a virus is already gotten past my protection ! hmmm
If I return to the message via edit (again, MagicvDave, thank you for teaching me about that EA forum feature) I can then "resubmit" and the proper image appears ! Like Magic !
I have also received a message that I have no space to send additional message to other players !! Usually just last a little while and then I can send messages again ! Weird messaging system indeed.