Iscadoodle

Message Centre has been working fine until a couple of days ago, Old conversations are there and I can converse with geo chums that I have contacted before, however any new conversations are not showing up on the left hand side preview pane. I have tried making contact via main menu & via profile or by clicking on "message this owner" with no joy. I'm using Mac OS & Safari loaded with all updated versions. Could this be a bug if so is there a link to technical support.