Server Errors and Problems

2. "Thumbnails do not display on MSIE11"

Since Joomla 3.9.3 a new "X-Content-Type-Options" header has been added on the htaccess file with the "nosniff" value. This header causes problems with images on MSIE11 as they don't get displayed regardless of the content-type that's set in the response.

To solve this issue, simple edit the htaccess file and remove the following lines from it:

## Suppress mime type detection in browsers for unknown types
<IfModule mod_headers.c>
Header always set X-Content-Type-Options "nosniff"
</IfModule>