Yes, the issue can be reduced to:
open parenthesis (or brackets), then something else (anywhere in the editor).
I detected a similar problem:
once you type an opening parenthesis, and then something else, it adds a new one at the END of the code
check http://code.google.com/p/pharo/issues/detail?id=2939
2010/10/6 Guillermo Polito <guillermopolito@gmail.com>_______________________________________________
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