From time to time I can't access HTML elements on the lower half of the screen in Salesforce. Resizing to a very short window and scrolling down allows me to click the elements. Looking through the page with Chrome's inspector has led to find the culprit: a div that looks like this (with many child elements):
<div class="slds-p-left--small salesforceIdentityAppLauncherDesktopInternal __web-inspector-hide-shortcut__" data-aura-rendered-by="587:33763;a" data-aura-class="salesforceIdentityAppLauncherDesktopInternal">
Setting the div to be hidden allows me to click on the page elements under it.
Is this a known bug in Salesforce? Is this from a bad app that I have installed?