On Solaris:
$ tclkit
% puts $::vfs::tclkit_version
200303.001
% source kitten.kit
% package require Expect
Segmentation Fault (core dumped)

I suspect that the Expect build for Solaris is not suited for your O/S version.
Will gladly accept a better binary - I cannot create one myself, since I have
no access to Solaris.
Here's what kitten.kit contains:
/lib/expect-5.31/SunOS/
283964 30% 2003/01/21 00:48:16 expect.so