I submitted this problem to the tcl bug tracker, too.
The same problem happens on my i386 (FreeBSD5.1-CURRENT).
Problem:
11:06(1025)% tclsh8.4
% package require Mk4tcl
2.4.9.2
% mk::row create
_._!1._!0
% !!
mk::row create
_._!1._!0
% !!
mk::row create
zsh: segmentation fault (core dumped) tclsh8.4
11:09(1026)%
It always crashes after the second ``!!''.
When I type ``mk::row create'' by hand it crashes after the 20th repetition (i.e.
21st ``mk::row create'').
The following script crashes on the first call of ``mk::row create'':
11:15(1026)% tclsh8.4
% package require Mk4tcl
2.4.9.2
% set i 0 ; while {1} {puts stderr [incr i]; mk::row create; puts stderr "success"}
1
success
2
zsh: segmentation fault (core dumped) tclsh8.4
11:15(1026)%

Row creation appears to be weird in Mk4tcl (it does things somewhat differently
from the C++ and Python bindings). I tend to avoid using it, inserting an empty
row in a view instead, and then filling it.

solved in Mk 2.4.9.3