Running both ScriptRunner 3.0.10 and JIRA Agile 6.6.70 on JIRA 6.3.12,
a JavaScript error banner related to ScriptRunner batch.js file pops up when opening JIRA Agile "Manage Boards", or when opening "create issue" window over a JIRA Agile board.
These errors only pop in Firefox, but not in Internet Explorer or Google Chrome. Disabling the Script Runner plugin solves this issue.