Hi Greg,
the problems with web applications refer to windows - on Linux with SBCL (a combination I am using myself) I had never such problems. To run tcl/tk, LTk tries to run "wish". Can you check whether wish is in your path and which version it is? Just type wish at the shell and see what happens. If it is not in the path, either add it to the path, or change the variable *wish-pathname* to contain the wish executable to run. (On some systems it is called wish8.4 or wish8.5 for example).
If that all does not help, please try to paste the whole error output into a mail.
Peter