Chat pro problem with send (enter gets linedown)

Hello, yesterday i purchased the pro version of the Chat. The problem is that whenever someone presses "enter" to send the message it keeps on changing lines. I checked your forums about a solution and the answer was that deactivate all plugins till i find it working. Chat is working fine on twenty-eleven but not in my theme (Meshable from Themeforest). My website is http://www.radionw.gr chat is located at http://www.radionw.gr/listenlive (now its disabled) i want you to find me a solution in this problem which means fix this bug not disabling other addons or using "twenty-eleven" theme otherwise i want to get a refund on my purchase. Thanks for your time, i hope we can find a solution!