Template debug log

Run application binary directly in a terminal to get TCL output from puts etc

$ /Applications/Hex\ Fiend.app/Contents/MacOS/Hex\ Fiend

Now in some template do puts test and you will see test on the terminal

Find position for script crash

Wrap code in a catch and print error on crash. This will hide the error from Hex Fiend and also show the parial tree.

if [catch {
    # call parse code
}] {
    puts $errorInfo
}