File system permission errors

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I have two Concrete5 sites under development on the same dedicated server that otherwise runs several other PHP based sites, and a couple of python sites. They run well.

We use suphp layer to manage php user file system permissions.

I have a problem with concrete5 installations in that after every file access that concrete5 makes, I have to run a chmod 755 on the concrete5 directory to restore access to the files and load the site correctly.

I would like to know how to fix this problem. I did not see anywhere in configuration files where file permissions are set, but I am hoping that I missed something simple. For example it would be great if I can tell concrete5 to use 644 for files and 755 for directories, for every file it modifies or saves. Right now it is not the case and I cannot even tell which files it is messing with - the error manifests itself by css files failing to load.

Thanks,

V.