[Pharo-users] RBParser bug ? (Morphic corruption)

If I do something normal in the Playground like RBParser parseExpression: 'bac' and inspect it , it works fine If I do something like RBParser parseExpression: 'bac->'. Then it displays an error and things really get weird I get redraw problems with Morphic(if I start moving windows around), with windows leaving trailing images behind and Pharo slowing down. Can anyone reproduce my problem ? I can reproduce this behavior in 6.1 32 bit and 64 bit and with other incorrect syntax strings.