STM32F746G-DISCO + atollic truestudio + CubeMX + GDB debugger + stlink + stemwin debuger always gets trapped in the LTDC_IRQHandler

[ETone]

I'm debugging a stemwin application and whenever I try to use the step over command in the debugger I wind up in the LTDC_IRQHandler routine. The program works as is but when I try to single step, I stop at the above point. Any help? The display file was generated by the stemwin GUIBuilder V5.40a, Truestudio 9.1.0, CubeMX V4.27.

Project was put together using the tutorial from

http://slemi.info/2018/01/16/stemwin-touch-screen-stm32f746g-dicovery-bonus-part-6/

Any thoughts are appriciated.