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Space characters after a non-ASCII Unicode character do not display.
When a space character appears in text after a Unicode character that is not in the direct ASCII subset, the space is not rendered or even present it appears. When moving the cursor and deleting text, it appears to not exist.
The problem has been confirmed by opening the same files in TextMate where they are displayed correctly.
Thanks to @elliottcable for helping to work out exactly what was going wrong.
Customer support service by UserEcho