What clears script local variables

[Dar Scott]

I'm finding a script local variable is being cleared.  I can't figure  
out where or how.  I know setting the script will clear a script  
local variable.  Can anything else?  Other than a 'put' and the like?

I check at all places it is set to assure it is not empty.  The later  
in something else it comes up empty.  All are below the variable in  
the script.

Dar Scott