It seems that for Contao 3.1 a change in the .htaccess will be needed for your images, css and js files to remain accessible. (basically everything inside your html or assets folder)
I am having trouble with about every extension in the repository on the 3.1 RC1, some don't even work anymore. So for everyone; if an extension doesn't work it may be that images, icons or other files are not loaded.
To fix this copy the .htaccess file from any core module (like newsletter system/modules/newsletter/assets/.htaccess) into the html or assets directory of the extension that doesn't work. Also rename .htaccess files in the root of the extension (system/modules/extensionname/.htaccess), unless that makes the extension unable to function again.
Contents of the .htaccess for 3.1.RC1 is:
Code:
<IfModule !mod_authz_core.c>
Order allow,deny
Allow from all
</IfModule>
<IfModule mod_authz_core.c>
Require all granted
</IfModule>
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