For one of my sites I can find the logs in /var/log/ispconfig/httpd/sitename, but not in /var/www/sitename/log. I check for another site working ok and cannot find any symbolic link that tie both paths somehow. What is missing for the malfunctioning site, should the paths be hardlinked or something? Thanks!
It's not a symbolic link but done in /etc/fstab automatically when the site is created. You'll be missing a line there. Apparently something failed during the site creation.
Rebooting the server solved the problem. The line was in fstab, I think the reboot reloaded fstab and tied the folders.
Then it looks like the name change was indeed the cause of your problem. Probably fstab wasn't reloaded afterwards, which the reboot now did. @till could this maybe be a bug in ISPC?
I've not seen this on any server yet, and I rename sites regularly on my servers too. But I will test it again.