You can use bugzilla to either report a bug or search or track any bug you wish: http://bugzilla.tkzinc.org
For more information on how to use bugzilla, please look at http://www.bugzilla.org. Bugzilla can also be used for reporting some enhancement which you think could be useful to Tkzinc. In this case, use "enhancement" as the severity.
Thanks for reporting bugs!
The Tkzinc bugzilla is provided by Intuilab as a support to the community.