I informed - on a Sunday - Andrew to tell him that the update of the new and latest version of Flexbanner didn't work ( through the component installer and through the Joomla installer).
Within the hour I got a completely new component ( for free ). And this components works very well under Joomla 2.5.0
Thanks a lot Andrew for your professional support and quick reply. Flexbanner ... a great component. Worth a donation !!!