Workaround for Chrome 41 issue Canvas + Radeon :

juliandescottes · juliandescottes · commit 6328fe760f87 · 2015-03-24T16:02:47.000+01:00
Issue opened at https://code.google.com/p/chromium/issues/detail?id=469906 Workaround in FrameRenderer.js is to decrease the width+height of the fillRect of 1 pixel. Issue seems to impact only Radeon users (not sure if all cards are impacted)
diff --git a/src/js/rendering/frame/FrameRenderer.js b/src/js/rendering/frame/FrameRenderer.js
@@ -239,7 +239,7 @@
 
     if (this.canvas.width*this.zoom < this.displayCanvas.width || this.canvas.height*this.zoom < this.displayCanvas.height) {
       displayContext.fillStyle = Constants.ZOOMED_OUT_BACKGROUND_COLOR;
-      displayContext.fillRect(0,0,this.displayCanvas.width, this.displayCanvas.height);
+      displayContext.fillRect(0,0,this.displayCanvas.width - 1, this.displayCanvas.height - 1);
     }
 
     displayContext.translate(

Original file line number	Diff line number	Diff line change
`@@ -239,7 +239,7 @@`
`239`	`239`
`240`	`240`	`if (this.canvas.widththis.zoom < this.displayCanvas.width \|\| this.canvas.heightthis.zoom < this.displayCanvas.height) {`
`241`	`241`	`displayContext.fillStyle = Constants.ZOOMED_OUT_BACKGROUND_COLOR;`
`242`		`- displayContext.fillRect(0,0,this.displayCanvas.width, this.displayCanvas.height);`
	`242`	`+ displayContext.fillRect(0,0,this.displayCanvas.width - 1, this.displayCanvas.height - 1);`
`243`	`243`	`}`
`244`	`244`
`245`	`245`	`displayContext.translate(`