Hi，Michal I used Pharo 3 or 4 in Windows and happened to the similar problem, l found: (Notice the Bold Part) HandMorph>>generateKeyboardEvent: evtBuf "Generate the appropriate mouse event for the given raw event buffer" | buttons modifiers type pressType stamp charCode keyValue keyEvent | stamp := evtBuf second. stamp = 0 ifTrue: [stamp := Time millisecondClockValue]. pressType := evtBuf fourth. pressType = EventKeyDown ifTrue: [ type := #keyDown. lastKeyScanCode := evtBuf third]. pressType = EventKeyUp ifTrue: [type := #keyUp]. pressType = EventKeyChar ifTrue: [ type := #keystroke]. modifiers := evtBuf fifth. buttons := modifiers bitShift: 3. keyValue := evtBuf third. charCode := evtBuf sixth. "Adjustments to provide consistent key value data for different VM's : - charCode always contains unicode code point. - keyValue contains 0 if input is outside legacy range " "If there is no unicode data in the event, assume keyValue contains a correct (<256) Unicode codepoint, and use that" (charCode isNil or: [charCode = 0]) ifTrue: [charCode := keyValue]. "If charCode is not single-byte, we definately have Unicode input. Nil keyValue to avoid garbage values from some VMs." charCode > 255 ifTrue: [keyValue := 0]. type = #keystroke ifTrue: [combinedChar ifNil: [ | peekedEvent | peekedEvent := Sensor peekEvent. (peekedEvent notNil and: [peekedEvent fourth = EventKeyDown]) ifTrue: [ (CombinedChar isCompositionCharacter: charCode) ifTrue: [ combinedChar := CombinedChar new. combinedChar simpleAdd: charCode asCharacter. (combinedChar combinesWith: peekedEvent third asCharacter) ifTrue: [^nil]. ]]] ifNotNil: [ (combinedChar simpleAdd: charCode asCharacter) ifTrue: [charCode := combinedChar combined charCode]. combinedChar := nil]]. self flag: #fixme. "This piece of code handles the creation of scrolling events. When a scroll is done by the user, the VM forwards a keystroke event with the up/down key. So we reconvert it to a MouseWheelEvent in that case." (type = #keystroke and: [(buttons anyMask: 16) and: [charCode = 30 or: [charCode = 31]]]) ifTrue: [^MouseWheelEvent new setType: #mouseWheel position: lastMouseEvent cursorPoint direction: (charCode = 30 ifTrue: [#up] ifFalse: [#down]) buttons: buttons hand: self stamp: stamp]. keyEvent := KeyboardEvent new setType: type buttons: buttons position: self position keyValue: keyValue charCode: charCode hand: self stamp: stamp. keyEvent scanCode: lastKeyScanCode. ^keyEvent MayBe it works. Have a fun! BingLiang