I just picked up a Descent and trying to hook up it up to Garmin Express. Everything works fine until I get to my login page. The pop up page pops up to login but its blank. It also does this with create an account "button" ciq.forums.garmin.com/.../1453470.png
I found a workaround that is fine for me. For all dudes running Yosemite and do not want to update to El Capitan, or even later OS X versions. You may run an USB-Stick or SD with the latest OS X version. In my case it works smoothly with macOS Sierra installed on an USB-Stick :)
I have uninstalled the Garmin Express application completely, them reinstalled v6.12.0.0, and it seems to have done the trick.
If you decide to try this, follow every step in the link above. I tried the simple "drag to trash" approach without going after all the libraries/preferences/caches and that didn't work. Following all 21 steps in the link above did work.
Thank you, that appears to have worked for me on Mojave MacBook Pro
Amazing - - I happened to hover with the mouse and discovered that the login and password boxes are there but not visible. I carefully entered my credentials and was able to make it work.
