> I just changed something minor in the OpenVPN Server configuration
> in the webinterface and after saving I again got an empty line in my
> certificate.


maybe this is a newline problem... i've seen this before when the script 
puts a "\n" in the textarea, and the browser sends back a "\r\n". in 
such a case something like $str = preg_replace('/[\r\n]+/', "\r", $str) 
can help.


>> Idea: to avoid this sort of problem, why not replace the 'copy -> 
>> paste' approach by a 'browse -> upload file'?
>>
>> (To be honest, I don't even know if it's possible to do that without 
>> having to reload the HTML page several times...)
>

I think it should not be a problem. see 
http://ch.php.net/manual/en/features.file-upload.php


regards,

Alexandre