THE PROBLEM
Sometimes, in Firefox*, InVision never loads your list of projects. Instead the loading animation spins interminably.
THE CAUSE
Something is wrong with the cache. You can confirm this in Firefox by opening a New Private Window, then logging into InVision.
Does the problem still occur? If not...
THE SOLUTION
Open Firefox History (Ctrl+H), right-click an InVision page, and choose "Forget About This Site"
The next time you go to InVision, projects should load as normal!
* Note: Chrome has been observed with this issue as well. But Chrome History unfortunately lacks a "Forget About This Site" option.