eZ Flow contains some custom fetch functions. Because of http://issues.ez.no/11718 loading fetch functions requires the classes used for the fetch functions to be autoloaded. Currently the autoload arrays are not updated by the setup wizard afaik, so some fetch functions in extensions won't work as expected.

ezwebin is not affected, the default extension autoload array contains the classes of ezwebin as well. Although it might not have been installed. We should correct this as well as soon as the installer has been fixed.