@MacGyver said: ...transfer my FP-Website from Webspace A to Webspace B...
Hm, did you also this with your config dir? If so, it is possible that the setting file had the old url. Did you rebuild your index after moving to the new location?
the "settings.conf"-file in the config dir of Flatpress. To rebuild, login to Flatpress, admin panel and maintain. There is a link "Rebuild index".
But the rebuild only works, if Flatpress is ok.
Edit the defaults.php file and add:
ini_set('error_reporting', 'on');
error_reporting(E_ALL); I've had the white page plenty of times when trying to take a shortcut around the tried and trusted way of transferring your FP to a new server, which is to install a brand new version as Piero just said, then run setup, then transfer your content files, then rebuild the index.
Had all manner of problems with trying to do it any other way.