LTK was written by Peter Herth.
Download ASDF package from http://www.peter-herth.de/ltk/ltk-0.91.tgz
Although the last release is somewhat dated, the project is still under active development. Most activity happens on its mailing list
Recent improvements could could be found in svn repo at http://ltk.rplay.net/svn/trunk/ltk
This may be an issue limited to certain Lisp implementations, as SBCL has not been observed to manifest this problem.
See cl-tk or clTcl for alternatives.
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Also linked from: cgn cl-cbr Common Lisp and gnuplot Lispy Screenshots
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