Summary

Certain Excel .xlsx files cannot be uploaded while AdBlock is enabled.

Steps to Reproduce

1. Create a .xlsx file
2. Have a browser with AdBlock extension installed.

Expected Results

• The file is uploaded successfully.
  

Actual Results

• You get the following error while trying to upload the file:
  

File <filename> was not uploaded. An internal error has occurred. Please contact your administrator.

• On console you will get the following error:

  Failed to load resource: net::ERR_BLOCKED_BY_CLIENT
  

Notes

• This problem is intermittent - it is not occurring with every .xlsx file.

Workaround

• Disable AdBlock to upload the desired file.