Since everyone has already tested 5.6.x (and strangly 5.6.0 seems ok?).. here's the lowdown on a 5.005_03 machine: this problem (prints only '(this)') occurs on Debian 2.2 (potato), with perl 5.005_03. Perl and the base modules are all from .deb packages.

Let me know if you want some -V output or anything else.