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I'm using the Reboot theme and created a child theme rebootchild. As a test, I want to change the font size, so I opened sp-resources/forum-themes/rebootchild/styles/rebootchild.php and added this line (it's the only thing in there):
#spMainContainer { font-size: 2em !important; }
When I refresh the forum the F12 tools confirm that the file is getting to the browser but it won't recognize the CSS. This is happening in multiple browsers and I confirmed it's not a browser cache issue.
The only clue that looks out of place is the HTTP response headers are specifying rebootchild.php as text/problem-with-post-edit-buttontml instead of text/css. Not sure why the server is doing that or if it's relevant, but reboot.php is being correctly sent as text/css.
You can see this for yourself here.

Did you add the header. The child css (php) file will need the following header at the very top of the file:
<?php
header("Content-Type: text/css; charset: utf-8");
header("Expires: ".gmdate('D, d M Y H:i:s', (time()+900)) . " GMT");
?>
If you haven't added that then that is probably the problem.
We are planning to include child theme 'frameworks' probably in the next update which will help in the future.
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