Unable to upload or view files through the CKEditor
I'm not sure this is an answer to your question, since you seem to have a specific error. Nevertheless, we've had a similar problem and so it may be helpful to hear our solution: When the file browser gives a blank screen for our users, the problem seems to arise from slow internet connections causing some problems in the computer's DNS cache. If we clear the browser cache completely AND also the computer's DNS cache then it magically works again. 

This is for us in Civicrm 5.10 and Drupal 7 latest, so again, our situation may be different to yours. For instructions on clearing computer's DNS caches we used links like this for mac and this for Windows 10.