Whenever i click send message, it brings up the screen normally. when i go to type the namer of the receiver or a message, the screen goes white in the area where the message box appears.
It sounds like a memory issue on our side to me. Do you have a lot of messages in your inbox or sent items Kalor (or anyone else who has the problem)?
The last sync brought over some optimisations to the DM system that should have helped a bit, but I don't really have a good setup where I can test and reproduce the problem.