[xwiki-users] Groovy macro in a panel?

Running 3.3 I've tried several times to include a groovy macro in a panel and it always results in "org.xwiki.rendering.macro.MacroExecutionException: You don't have the right to execute this script", although my id has programming rights. So... I simplified, creating a Groovy macro consisting solely of a simple 'println "* This is groovy."'. Same results. The odd thing is that it works fine when I'm viewing the preferences page (/xwiki/bin/admin/XWiki/XWikiPreferences), but nowhere else. Some sort of rights issue, or is this a misleading exception? A known bug? Any help would be... mmm.. helpful?