Peltier Technical Services, Inc.

Peltier Tech Charts for Excel 3.0

Known Issues: Add-In Disappears from Excel


The tab for an installed add-in does not appear in Excel's ribbon, but the add-in is checked in the Add-Ins dialog.


A Microsoft Office Update for July 2016 causes Excel 2010, 2013, and 2016 to block files which were created on another computer, due to potential security concerns. The add-in will load successfully when it is installed, but when Excel is later restarted, it will not load the blocked file.

Note that this can occur for any third-party add-ins, not just Peltier Tech's.


There are two ways to deal with the issue. The long-term solution is to install the add-in from a Trusted Location. The short-term solution is to unblock the add-in Workbook. In most cases a user may have to take both actions.

Long-Term Solution: Install Add-In from a Trusted Location

For a number of reasons, it is advantageous to store the add-in workbook in the User Add-In Library directory:




Any add-in stored in the User Add-In Library directory will automatically appear in the Add-Ins dialog without having to install it first, eliminating the need to browse to find it during installation. Also, the User Add-In Library directory can be made into a Trusted Location using the following protocol. Once the User Add-In Library is a Trusted Location, any add-ins can be installed from this location without having to be unblocked.

For some users, making the add-in's parent folder a Trusted Location has not been sufficient, and the add-in file itself must also be unblocked: see below.

Short-Term Solution: Unblock Add-In Workbook

This allows you to install the add-in from any directory on your computer. However, if you receive an updated add-in workbook, you must unblock the updated workbook before it will open.

Unblock Add-In Workbook

Back to Documentation


Peltier Technical Services, Inc.

Excel Chart Add-Ins | Training | Charts and Tutorials | Peltier Tech Blog

Peltier Technical Services, Inc., Copyright © 2016. All rights reserved.