Customer portal logo broken on IE11

Summary

In JIRA Service Desk, IE11 will only render a custom logo on a customer portal if the image is in a .PNG format. .BMP, .JPG, .GIF logos will break in IE11(see screenshots). Chrome, Firefox and Safari will render the any of the mentioned image formats without issue.
 

IE11	Chrome

Environment

JIRA Service Desk 3.3.0-OD-1000.1015.2

JIRA 1000.815.2

Steps to Reproduce

On JIRA Service Desk:

1. Navigate to: [NameOfYourProject] > Project Settings > Portal Settings: Logo
2. Click "Choose logo" and select a .BMP, .JPG or .GIF image
3. Save the selection
4. Access the customer portal in IE11

Expected Results

Logo image is rendered in IE11

Actual Results

Image is not rendered in IE11 (see screenshot in Summary)

Notes

• Renaming an image to .PNG will not work - the image needs to be converted to a .PNG
• Firefox , Chrome, Safari will render all the mentioned image formats
• Testing was conducted on the following browsers:
  • Firefox 51.0.1 (64-bit)
  • Safari 10.0.3
  • Chrome 56.0.2924.87 (64-bit)
  • IE11 11.0.9600.18097

Workaround

Convert your logo to a .PNG image and upload to your customer portal.