I get an error when unpacking the newest tar file:
$ tar xzvf roundup-0.7.10.tar.gz
roundup-0.7.10/
roundup-0.7.10/demo.py
tar: Skipping to next header
tar: Archive contains obsolescent base-64 headers

gzip: stdin: invalid compressed data--format violated
tar: Child returned status 1
tar: Error exit delayed from previous errors

I have a Debian 'sid' system with:
$ tar --version
tar (GNU tar) 1.14
$ uname -a
Linux treasure 2.6.10-bk6-treasure1 #1 Tue Jan 4
00:59:19 CET 2005 i686 GNU/Linux