Can't get rid of 404 error I set up my first Craft site on my shared hosting and I can't get it to work for the life of me. Whatever I do, I run into a 404 error. .htaccess is there and named correctly, craft folder is one level up as it should be. 
What I noticed is that it briefly works after setting the correct permissions on the craft files and folders. A couple of clicks later the permissions seem to reset again back to 755. 
I haven't had this problem with my hosting before, so I am unsure if this is a craft problem? Or if the permissions even are the cause?

Edit: It doesn't appear to be a permission problem after all. Filezilla shows 755, although the permissions are set to 744. So now I'm at a total loss what the issue could be.... I can't even complete the installation because it stops working beforehand.
Tried several times more and got it installed. Just before it goes wrong again, I can see that it doesn't load the site properly, e.g. the login screen looks weird. Has anyone seen this before?
Do you happen to be on Dreamhost? I had a site there recently where they changed my permissions "for my own good".