If any of these things are happening, here are some tips to help get things back in order.
If BERT has disappeared (it used to be there, and now it’s gone), then it is very likely Excel has disabled the add-in. Because Excel maintains a list of disabled items, uninstalling and reinstalling will not help; but it’s easy to fix if you know where to look.
Open the Excel Add-ins dialog (File tab > Options > Add-ins).
At the bottom, in the drop-down menu select Manage Disabled Items and click Go.
If there’s an entry for BERT in this list, select it with the mouse and click Enable. You may have to restart Excel for the BERT toolbar menu to show up.
If you get that dialog asking you to disable BERT, or if it crashes every time you enable it, you may have some code in your startup folder that is causing problems. When BERT starts it will read all the files in your startup folder (by default, this is
The best way to figure out what is causing problems is to move all the files out of that folder and try starting Excel (and BERT). If you can now start up OK, then something in one of those files is causing problems. Add your files back one at a time to see which one is the issue, and then check that file to see if you can figure out the issue.
Obviously crashing is not the desired behavior, even if there’s a problem in your R code. If you do have some code that causes crashes, please post a note over at the github issues page so we can have a look.