Maybe this has already been mentioned on the old board but didn't find it doing a search of the bug forum.
From the help file.
/unload <-a|-nrs> <filename>
Unloads the specified alias or remote script file.
/unload -a aliases.ini unloads the alias.ini file
/unload -rs script.ini unloads the script.ini file
The -n switch prevents a script from having the on unload event triggered.
//unload -rs $script(1)
works fine
//unload -nrs $script(1)
echo's to status * /unload: invalid switch