PowerPoint

You double-click the deck, the splash screen shows for a second, then the window disappears. No error dialog, no “PowerPoint has stopped working”, nothing in the title bar. Sometimes it happens with one file, sometimes with every file you open. The useful question is whether the program is closing itself or dying while it renders this deck. Those look identical and need different fixes. ...

The loop looks like this: you open the deck, PowerPoint says it found a problem and offers to repair, the repair “succeeds”, you save, and the next open asks again. Nothing is being repaired, because PowerPoint is fixing the symptom each time and writing the same broken part back into the file. ...