Any chance the host is running suPHP or suExec? In that case, directories should be 755 and files 644.
This is on my local machine, and no, neither suPHP or suExec are installed.
I’ve tried experimenting with permissions, up to and including changing ownership of the whole of core/cache and all sub-dirs and files to me and setting all permissions to 0777, then flushing all caches, etc... but it didn’t make any difference, sadly.
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There is a setting (not sure if it’s server or PHP) to limit the depth of directory levels for running a script from. One site I was working with had this set to 4, and TinyMCE has a .php file six levels deep; once the hosting tech support changed that setting all was well.