The security update is blocking files that have been downloaded from the internet.įiles downloaded from the internet now have a Security property that is automatically set to Block.
Microsoft released an Office Update in July 2016 that is causing this issue with installed add-in Ribbons disappearing. Why Did My Add-in's Ribbon Menu Disappear? This article contains a few solutions for this issue.
Bottom line: A recent Microsoft Office security update has caused add-in Ribbon Menu Bars to disappear when Excel is opened.
