With the webserver already up and running on my router, I figured that the easiest way to have other people upload data to my place is via one of the hundreds php-based upload scripts. When I give it a try, I can watch /tmp fill up, then my browser gives me a 'Done', /tmp is tidy again, but the uploaded file is nowhere to be found. I enabled error logging in php.ini, but lighttpd_error.log only shows the server has been started. And I am not testing with large files either (>2MB). The target directory has all the rights it could possibly want.
This may be just a php problem, but any suggestion on how to enforce error logs or WRT-related issues which may be the cause here are very welcome!

Do I love my router-thingy!