If you have a MoodleCloud account, you might try it there and see what happens. Or try on qa.moodledemo.net. This might help you determine if your problem had anything to do with your computer's Java or your browser. Which reminds me, have you tried from another browser? Have you purged Moodle's cache? Have you reset your browser's cache? Just trying to help you think through this situation, Paul.
General help
Moving Topic Blocks with Course causes Moodle to Hang
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