we installed Sellacious for the first time.
After wondering why the component couldn't load, we found out why:
In our .htaccess file we have a command that get's rid of the ugly trailing slash "/" at the end of the URLs.
We have it because Joomla doesn't have the option to turn these off for the default pages of each language:
When we deleted the command Sellacious was able to load.
But we do want to have our "clean" URLs. So what can we do to still use Sellacious?
P.S.: No other component ever made these problems.