Im running across and an issue with using Explorer and Chrome.
I primary use Google Chrome but, it won't allow me to upload the tabard file. When I attempt to upload the file it just simply does nothing.
When I use Explorer it will upload the file and show the correct tabard image. Though once i return to the website using Google Chrome it will show the old guild logo instead of the new one.
The issue with Chrome displaying the wrong Tabard is most likely caused by Chrome not having re-cached the site yet. Is the wrong tabard still displaying in Chrome?
As for the upload issue. We were updating or SSL certs. Around that time and could have caused some bugs in uploading. Are you able to upload now?
Perhaps it's just a caching problem - although your site is currently saying there isn't a valid "tabard" file in your file library. Make sure you've followed the instructions here:
(I think it may be case sensitive .. and make sure it goes into the site file library)