Yep, there was a problem with chameleon. I can't see any other theme duplicating pix/i/ .. did you see the bug in any other theme?
Fixed it for chameleon. Please update http://tracker.moodle.org/browse/MDL-11594 if there is still a bug.
Mat (scyrma)
Themes
recent changings in 1.8.4 causing problems
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