[Pharo-project] MNU Error in Class Browser (Package Browser)

Hello, right mouse click in low frame (with code definition) of Class Browser raise error window "MessageNotUnderstood: OBTextSelection:" with first line "OBTextSelection(Object)>>doesNotUderstand: #isClassNode" after press "Debug" button I got another error window: "Error: Invalid utf8 input detected". I use pharo0.1-10309dev09.05.3.image on Windows XP Russian Edition. / Alexander.