Not sure if this is a once-off, but just reporting since its a bit strange. Into a newly minted 50588 image I had recently loaded Slice-Issue-17373...BenComan.12.mcz which however only introduces new code with no modification to existing code (except minor re-factoring of some tests) I was happily editing a method in the Browser when the problem occured. Its okay if I type within an existing word, but with space either side of the cursor, typing cause a primitive failure per the stack below. "....." notes some values. This occurs even from a new Browser window, on any method. In system settings, unticking and reticking [Use Free type...] causes red-pane-of-death on the problematic code panes with similar stack as below, but the problem is fixed in newly opened Browser windows. (btw the font had changed) Array class(Object)>>primitiveFailed: Array class(Object)>>primitiveFailed Array class(Behavior)>>basicNew: Array class>>new: .....sizeRequested --> nil FreeTypeFace(FT2Face)>>charmaps .....numCharmaps --> nil FreeTypeFont>>getLinearWidthOf: .....self face charmaps --> a FreeTypeFace with numCharmaps --> nil [ self getLinearWidthOf: aCharacter ] in FreeTypeFont>>linearWidthOf: in Block: [ self getLinearWidthOf: aCharacter ] FreeTypeCache>>atFont:charCode:type:ifAbsentPut: FreeTypeFont>>linearWidthOf: FreeTypeFont>>widthOf: LogicalFont>>widthOf: RubCompositionScanner(RubCharacterScanner)>>setFont RubCompositionScanner>>setFont RubCompositionScanner>>setStopConditions RubCompositionScanner>>endOfRun RubCompositionScanner>>composeFrom:inRectangle:firstLine:leftSide:rightSide: RubTextComposer>>composeEachRectangleIn: RubTextComposer>>composeAllRectangles: RubTextComposer>>composeOneLine RubTextComposer>>composeAllLines RubTextComposer>>composeLinesFrom:to:delta:into:priorLines:atY:textStyle:text:container: RubTextComposer>>composeLinesFrom:to:delta:into:priorLines:atY: RubTextComposer>>recomposeFrom:to:delta: [ self composer recomposeFrom: start to: stop delta: delta ] in RubParagraph>>recomposeFrom:to:delta: in Block: [ self composer recomposeFrom: start to: stop delt...etc... RubParagraph>>disableDrawingWhile: RubParagraph>>recomposeFrom:to:delta: Message>>sendTo: [ aMessage sendTo: next ] in RubOpeningClosingDelimiterDecorator(RubParagraphDecorator)>>doesNotUnderstand: #recomposeFrom:to:delta: in Block: [ aMessage sendTo: next ] BlockClosure>>on:do: RubOpeningClosingDelimiterDecorator(RubParagraphDecorator)>>doesNotUnderstand: #recomposeFrom:to:delta: In case its useful, I uploaded a fuel dump of the stack here... http://wikisend.com/download/365684/fuel.zip expires in 7 days, zip password = pharo /home/ben/.local/share/Pharo/VMs/spur/pharo-vm/pharo CoInterpreter VMMaker.oscog-eem.1630 uuid: 2ed025ea-f400-4440-8e8b-5aa46d06c9ab Jan 14 2016 StackToRegisterMappingCogit VMMaker.oscog-eem.1630 uuid: 2ed025ea-f400-4440-8e8b-5aa46d06c9ab Jan 14 2016 https://github.com/estebanlm/pharo-vm.git Commit: 21ec004cce7d26010c18d357c805a0e1a4ffe376 Date: 2016-01-14 11:42:33 +0100 By: Esteban Lorenzano <estebanlm@gmail.com> Jenkins build #498 cheers -ben