Occasionally, browser caching will cause videos in the timeline to become stuck in a loading state. When this happens, we recommend that users do a hard refresh to ensure that videos get reloaded into the project correctly.
To perform a hard refresh and bypass the cache, open the project in Maker and press the following key combination in the browser:
Windows: Ctrl + F5
Mac: ⌘ + Shift + R
The page should refresh and all of the videos in the project and on the timeline should reload. This could take a few seconds depending on the length and number of assets in the project.
For information on how to do a hard refresh in other browsers, see: https://en.wikipedia.org/wiki/Wikipedia:Bypass_your_cache