The Read Write extension is creating some stalling of apps in Classlink if you are experiencing issues with Classlink apps not loading or stalling, you might need to uninstall the extension.
Classlink is working on a solution, this was an app that was "forced to all students" we have set it to "allow install" so if you need it with students they can install for themselves using this link:
https://chrome.google.com/webstore/detail/readwrite-for-google-chro/inoeonmfapjbbkmdafoankkfajkcphgd?hl=en-US