I have an empty _config.php file in a widget folder. This seem to break the CMS and front end of the website. If I look at the source of the CMS everything seems fine, but when I look at how the code gets parsed by browers, it seems like it ends the head earlier than it should.
I've included a screenshot wich shows some weird margin bug at the top of the screen and the code as seen by the browser.
If I put "<?php" into the _config.php file of a module, "<?php" is added at the very start of every page, right before the doctype. As soon as I add a newline to the configuration file, everything works as expected.
Not sure if this is a bug or the punishment for wrong usage, but it's definitely annoying and hard to debug...