I was half way through creating a new site, and my browser crashed. Now when I try to recreate the site, ISPconfig says that the domain is already in use. However it's not in the DNSs or the Site list. If I do a search for it, but if I try to delete it doesn't change anything, it just stays there.
When you delete the site, does it show up in one of the recycle bin's afterwards? If yes, empty the recycle bin.
Sorry for the long delay in responding, got distracted by some other projects. No the entry doesn't appear in the recycle bin.