I checked all of the plug ins and found one or two that were a problem. That solved the problem of the drop down menu disappearing. However, now the drop down menu stays visible, but it is not responsive. I have to tap on the main menu items 2 or 3 times (sometimes 4-6 times) to access the sub-menu items.
I went through the plugins and deactivated them one by one again. It did not change the unresponsive drop down menu issue. I also ran a plugin troubleshooter that suggested that this is a theme problem or a MU plugin. Please let me know if there is a way to fix this second issue.
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This reply was modified 4 years, 2 months ago by kro1273.