am using package Tk::DBI::Table; 1.8 (version from the source)...So I guess there goes something wrong in the bigger program in which I use DBI::Table.

I just noticed that there is a Tk::DBI::Table in the author's Tk-DBIx distribution which has a version number in the source later than anything else (Distribution Tk-DBI-Table 0.01 has module Tk::DBI::Table version 1.3, Tk-DBI-Table 0.02 has module version 1.8, while Tk-DBIx has module version 1.13). It does not fix your problem though. I don't think there's anything wrong with the way you are using the module, it appears to be a bug in the module itself.