Ok, my provider did fix the fault and now everything is back again, also the testing site. :-)
The main mobiki site is actually up and running again. All my domains do run well if configured for Apache/PHP5.3, but do actually not run with the providers setup for PHP 5.4 as FastCGI server. So the testsite is still down for to be a testbed for the provider. I'm very sorry for that! :-( I will inform you as soon as the test site is up again.
I'm sorry, but since tonight all my 8 domains and the correspondending webservers at my provider are down. Hope, they will fix it soon.
For now there are two example websites using mobiki: my own website http://döring.net/index.php in german language and the mobiki.datenbrei.de site itself.
An open, cross-platform journaling program.
A scientific plotting package.