I just installed POC and have a few misgivings about the installation process (permissions!) .. but they're not critical.
I haven't seen it working yet, because - when I try to login the frameset only loads the right-hand side and the bottom bits .. I've not done a lot of research on it yet .. and your bug-tracker seems to be a favourite target for spam-bots .. but anyway - I'd thought I'd mention that the problem seems to occur with a JavaScript running so long that my FF decides to give me the option to stop it .. even if I let it run .. nothing happens.
The error console shows a number of problems.
2 from input.php (both "parent.output is undefined") and 2 from frameset.php ("frames.input" and "window.output" .. both "undefined").
Hope you can help!?!
re: permissions .. most troubling was when test.php claimed the server didn't have access to the chatter-icons-dir .. it did .. till I realized I had to also chmod then POC-test-file in there :-P
And - in general - world-writeable stuff is REALLY bad .. but I bet you're expecting knowlegeable people to just ignore your instructions and "do the right thing" anyway, eh?!?