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I have made a big mistake...
I was using newbb2 rc1, when upgrading to newbb2 rc3, I ran newbb2rc2_to_newbb2.php. I know it should be newbb2rc1_to_newbb2.php
After upgrading, everything works fine without problem except viewing attachment. files are actually uploaded to right path, but nothing happens when view a topic.
Does this problem come out with my previous wrong updating action? any suggestion to resolve it?
Many thanks.