Ok this is 2 days in a row I have had this problem.
When ever I want to "add a reply" I have to get completely out of LCT and then come back.
What happens is after I send the message I get a blank screen which says done at the bottom left hand corner. I have waited up to 10 minutes and nothing happens.
If I hit the refresh button everything will come back but I usually get a double post when I do that so I just get out of LCT and start over.