Did updating to SVN Tweener break everything?
I had downloaded Tweener from http://code.google.com/p/tweener/ a few months ago but needed to use it on a few GlowFilters. After doing some research I find out that the SVN trunk has support for GlowFilter and various other special properties.
After updating Tweener the rest of my Tweens broke. I started getting these errors:
## [Tweener] Error: The property ‘_blur_blurX’ doesn’t seem to be a normal object property of [object MovieClip] or a registered special property.
I looked into caurina.transitions.properties.FilterShortcuts and saw that they were labeled _Blur_blurX (capitalized letter) but that didn’t solve the problem.
I finally stumbled upon a forum post saying you must manually initialize the shortcuts so they are registered as specialproperties.
Basically, import whatever properties branch you need, like
import caurina.transitions.properties.FilterShortcuts
Then, before you use Tweener:
FilterShortcuts.init();
Done. It all works as it used to.
Tweener.addTween( mc, {delay:1, time:2, _blur_blurX:3 } );
Yuji Tomita 
I found this post while experiencing the same problem. As mentioned caurina.transitions.properties.FilterShortcuts uses a _Blur_blurX property, with a capital B.
The example code doesn’t use this capital B. So when experiencing this problem, make sure you’re using:
Tweener.addTween( mc, {delay:1, time:2, _Blur_blurX:3 }
Hi Paul,
Are you talking about my example code? My example purposely doesn’t use a capital B.
After running FilterShortcuts.init(), all worked as it always used to, with _blur_blurX 🙂