Hi. Unfortunately, you managed to find a shortcoming in the TransWeb
program. We are aware there is a problem, and are rewriting the
software as we find time. Until then, there's really nothing we can do
to fix the problems you've observed; we don't understand what causes
our software to exhibit this behavior only for some GIFs and not
others.  If the clickable imagemap format doesn't work, try the forms
interface.  I've found the forms interface to be much more stable.