Issue Summary

Cards sometimes fail to load when switching between connected cards using the Trello Desktop app.  

Steps to Reproduce

1. Create cards on different boards 
2. Connect the two cards by attaching a card link
3. move between the connected cards by clicking the card previews

Expected Results

the cards load

Actual Results

sometimes the card fails to load 

Workaround

When stuck in the loading state, press ⌘+ r (mac) ctrl+r (win) to refresh the desktop app. 

To avoid the issue, press the ⌘ key (mac) or ctrl key (win) when clicking to instead open the card in a new window. The issue does not affect the card when loading in a new window.