Hi Dealman,
I believe this is caused be some debugging tools. They stop things from printing to the screen and there has been bugs in the past related to this.
In 4.14.3, you can reproduce this by setting something to print to screen > PIE > then press the ’ - apostrophe key to bring up the debugger > press again to remove the debugger. Now, nothing will print to screen.
This is fixed and working properly again in the 4.15 Preview 1. Could you try reproducing your exact issue there and see if it was also fixed?