If you have windows vesion 2004 with Thinkorswim open and press Windows Key + Tab. Task bar keep flashing only way to exist out of it is to reboot or log off.
It seems like flickering bug is happening regardless of Task bar is enabled in Displayfusion settings. For now I have disabled displayfusion. See attached detailed log.
We've just released a new DisplayFusion beta version and this issue should be all fixed up. Please let us know if you run into any trouble after updating.
