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>
http://code.google.com/p/pharo/issues/detail?id=3069

if you type:

[] -> []]

() -> ())

{} -> {}}


Bye!

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