When using F360 one is constantly clicking on items in the timeline. (In my case, double tapping on Macbook Pro trackpad.)
Not infrequently a little comic-book speech bubble appears with details of the item in question. If that happens at the moment of the double tap it negates it so that the item is not opened. This can actually be infuriating, particularly if chance makes it happen several times in a row.
SUGGESTION: whether one double clicks on the icon or the speech bubble the item should "open".