V5.0 hangs on the FreeRTOS configuration window.

This is with Ubuntu 16.04 LTS. I upgraded stm32CubeMX to v5. Revising a previous project made before the upgraded worked, except for changes to the FreeRTOS, where it hangs and everything is locked up for stm32CubeMX. Right-clicking on the 'MX' icon allows quitting, and the non-FreeRTOS features begin working.

I tried restarting stm32CubeMX and starting a new project, and the FreeRTOS configuration window hangs the whole thing. Quitting the program via the icon the rest begins working the other features appear to work.