Tkx module is just a syntax for Tcl.pm perl module, which in turn just a thin layer to tcl/tk.

This means that most probably you're facing problem in tcl/tk itself.

what I see is tcl/tk 8.5.8 has problems with pinyin input, and tcl/tk 8.4.19 have not. http://community.activestate.com/forum/activetcl-8581-crashed-when-input-chinese-char

What is your OS?

Unfortunately I do not know good support user list for tcl/tk (well, I will ask people this question)

Meanwhile, you could repost your question to tcltk@perl.org mailing list, which is suport ML for users and developers for these Perl modules.

regards,
vkon