This page is missing a huge issue with this block, in my opinion the most common error that new Scratchers make. That being that in projects that are remotely complex, using more than one of these blocks will eventually cause weird, undefinable errors that do not repeat every time the project is run. A common workaround is to only use one of these blocks per project, followed by a broadcast to start all other scripts that need to run at the beginning of the project's execution.
Unless someone has an objection, I will add this information very soon.
Locomule (talk | contribs) 16:59, 27 November 2014 (UTC)