Command line instance won't terminate

I'm running a number of sessions via the command line, sessions that I've run previously using prior versions of screen-scraper. I haven't had any problems in the past, but lately, I've been having an issue with the command not terminating even though the job has completed.

In other words, when I launch the scraping session, I see the line "Running script [script name]" but when the job is finished, it doesn't go back to the command line; it just sits there on "Running script...."

Has something changed? Is there a command I need to add at the end of the script?

Thanks for your help.