UART + Gui Thread

Hi all,
I got a stm32f746 disco , I am running RTOS and have a gui Thread running.
I am trying to send a string out Uart1 when a button is pressed on the GUI.
The GUI is up and running, but when I try to send the data with button press all I am getting out is rubbish. The button press is calling a txData function which just transmits out a uint8_t buffer.

On startup when the UART is initialized I transmit out "Hello World" with the txData function to test the UART. This is working as I see "Hello Word" on hyperTherm that I am running when the board is initializing. But can't get it to work when being called from the GUI if anyone can help me on this thanks,

George.

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