2 files changed, 4 insertions, 3 deletions
diff --git a/history.txt b/history.txt
index 9cdc5c9..0efef9b 100755
--- a/history.txt
+++ b/history.txt
@@ -2484,3 +2484,4 @@ ______
 150415
 ------
 * Threads: flush Stage>>keysPressed when prompting the user
+* Objects: fixed #770
diff --git a/objects.js b/objects.js
index 1fe1309..db5ab88 100644
--- a/objects.js
+++ b/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));
     }
 };