The message appears in the Output Log in the editor, so with it closed I don’t get it of course. That’s essentially like restarting the editor. Also noticed that after that message appeared, the compile button inside the editor stops working.
Used the Top Down C++ template to test. As for steps, nothing special. After initial compilation opened the editor, added some code in C++, compiled in VS and get the failed message in the editor.
I just tried with the binary version of 4.51 that I got through the launcher, and to my surprise I get the same problem there.