The source on the bottom of the list never successfully loaded the FITS image (after >5 minutes). The progress bar is just spinning indefinitely. I don't know if there is an issue with this particular source or if this was a random failure. If it's the latter, we may need a "cancel download" button to give the user the ability to kill stuck downloads.

The source on the bottom of the list never successfully loaded the FITS image (after >5 minutes). The progress bar is just spinning indefinitely. I don't know if there is an issue with this particular source or if this was a random failure. If it's the latter, we may need a "cancel download" button to give the user the ability to kill stuck downloads.