Hi Karen,
Please try the method of Doug Robbins MVP and check if it works for you.
If you issue still exists, please try to rename the XLB file in your computer. XLB is a setting file format created by Microsoft Excel. XLB files contain custom settings for the toolbars (or command bars). These settings can be edited or customized by selecting toolbar from the view options.
Please go to C:\Users\username\AppData\Roaming\Microsoft\Excel, and rename Excel15.xlb to Excel15.xlb.old, restart Excel.
Any updates please let me know, I'm glad to help and follow up your reply.
Regards,
Emi Zhang
TechNet Community Su