How to reproduce: 1) Open examples from index.html (repository root) 2) Type something to any autocomplete field to get results. 3) Click and hold left mouse button for more than 200 microseconds on any result. Nothing happens, no results selected, results hidden. And this bug happens here and there for old/slow people you know.. But this bug is absent at devbridge website here: https://www.devbridge.com/sourcery/components/jquery-autocomplete/ And to add more frustration source code at devbridge is hidden very well, I was unable to find out how they did it.