It works for me:

X:\>perl -MDBI -e "DBI->installed_versions"
  Perl            : 5.008008    (MSWin32-x86-multi-thread)
  OS              : MSWin32     (5.1)
  DBI             : 1.58
  DBD::Sponge     : 12.008696
  DBD::SQLite     : 1.13
  DBD::Proxy      : install_driver(Proxy) failed: Can't locate RPC/PlC
+lient.pm in @INC
  DBD::Gofer      : 0.009560
  DBD::File       : 0.35
  DBD::ExampleP   : 12.009532
  DBD::DBM        : 0.03
  DBD::CSV        : 0.22
[download]

I have two guesses:

• The last line does not have a newline character and thus doesn't get processed Tested and it prints "2"
• The last line of a file is never processed

This is on Windows, with \r\n as line endings, but that should be OK.