Thank you for contacting us. Let's have you reset mSecure on the Mac that is not working to see if this fixes the issue:

To reset mSecure on your Mac:

1. Open mSecure on that device, and look in the top left corner of your screen. You should see "mSecure" in the menu bar. To the right of "mSecure," you should see the word "Help." You'll click on that in step #2 below.
2. Click Help in the menu bar at the top left of your screen. A contextual menu will appear. Hold down the "option" key on your keyboard, and you should see two hidden options appear at the bottom of the contextual menu.
3. Click "Show Data File in Finder", and a Finder window will appear revealing mSecure's database file, which is named, "mSecure.mscb"
4. Close mSecure
5. Move the "mSecure.mscb" file to the trash

Now you have reset the Mac app, and you're ready to sign back in to your mSecure account:

1. Open mSecure if it is closed
2. Skip the welcome screens to go directly to the Sign Up / Sign In screen
3. Click "Sign In"

Enter your mSecure account's email address for the username, then enter the password for that account to sign in. Did this work for you?