Hallo,
I did a fresh install of roundcube 0.8.2. Everything's working fine. But the UI display is without any styles, just text and buttons in a distorted order (menus show up beneath the messages etc). I don't get any error message. I tried different things but to no avail. One thing I discovered is that, when I configure roundcube to write error messages on the screen and provoke error messages by changing permissions to some folders, the GUI styles show up with the error messages in the background. But if there is no display of error messages in the background the styles are disappearing as well.
I would appreciate any helpful hint, thanks!
edit: I wanted to add, that I tried different browsers (chromium, firefox, midori, arora) always with the same result