I've been working on an install for my lan and everything seems to be running smoothly, but I am having problems changing themes. I have my ftp daemon up and running and and able to download the themes and I can even see them as a choice in my themes menu. However, when I activate the new themes I get a msg that says they are active, but only get the white screen. At this point I don't have plugins going so I know that is not the cause of the white screen.
I've tried several different themes and the only ones that I can get to work are the default themes that came with the install.
I've gone through all my permissions and have set those correctly (at least I think I have). Although this feels like a permissions problem. Is there a php file that changes and gets written to when a theme is changed? I own my wordpress file in /var/www/wordpress and /usr/share/wordpress all the dir are 755 and files are 644.
My thought is that the problem is somewhere in how wordpress loads a theme. I think that it just doesn't see the file and therefore can't load it, or doesn't have the permission, but I'm not sure where this code or file might be.