fixed #770

history.txt

@@ -2484,3 +2484,4 @@ ______
 150415
 ------
 * Threads: flush Stage>>keysPressed when prompting the user
+* Objects: fixed #770

objects.js

@@ -125,7 +125,7 @@ PrototypeHatBlockMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.objects = '2015-February-28';
+modules.objects = '2015-April-15';
 
 var SpriteMorph;
 var StageMorph;
@@ -3081,7 +3081,7 @@ SpriteMorph.prototype.setEffect = function (effect, value) {
     if (eff === 'ghost') {
         this.alpha = 1 - Math.min(Math.max(+value || 0, 0), 100) / 100;
     } else {
-        this.graphicsValues[eff] = value;
+        this.graphicsValues[eff] = +value;
     }
     this.drawNew();
     this.changed();
@@ -3096,7 +3096,7 @@ SpriteMorph.prototype.changeEffect = function (effect, value) {
     if (eff === 'ghost') {
         this.setEffect(effect, this.getGhostEffect() + (+value || 0));
     } else {
-        this.setEffect(effect, this.graphicsValues[eff] + value);
+        this.setEffect(effect, +this.graphicsValues[eff] + (+value));
     }
 };