I have cleared the cache in my browser and am running some tests to see if we are now able to reply to messages. Some messages appear to be sending now and others don't. The ones that send record the text in the conversation and the ones that don't simply take you back to the conversation with no change and the editor is closed and as if 'reply' was never pressed.
Changing status of emails - I have noticed that if you are looking at the inbox and tick an email (instead of opening the email) you can change the status no problem. For example if I change it to 'Closed' it moves and the screen refreshes. If however I open an email and change its status to 'closed' nothing happens on screen and the email status sometimes changes but gives no indication on screen that it has changed. This happens in Chrome and IE.
The bounce issue seems to have only been one email. I will forward the bounce to you now.
The speed issue is very strange. It seems worse in IE than Chrome. If I open login to the system in IE it takes time for the onscreen graphs to load. If I am viewing an email I can not always click 'Reply' (I see a no entry sign) in IE but in chrome the the no entry sign goes after 5 to 10 seconds and I can then press reply.