Any entry in SkipHosts forces dropping of all records. Only if SkipHosts="" the records are processed.
The strange thing on this error is: The same configuration of AWStats version 7.0 worked fine on a system using PHP 5.3.3 / Perl 5.012001. The problem occured after updating to Apache 2.2.21 with PHP 5.3.8 and Perl 5.014002.
System configuration and logfiles attached below.