PNG,HTML5 and Change Viewstate problem

[GIOLETS]

I have the following problem: using PNG images, with multiple states (in my attached example, I have 3 states), I have noticed that changing the state the previous image still remain in backgroud, with no apparent rules, it happens randomly changing from states 0 to 1 or 1 to 2, etc.

The problem is only related to the HTML5 version, using Flash there is no issue.
And of course is only related to PNG images, using JPG I have no problems (but also no way to have a choice for the background color).

I've attached a simple test file in order to verify the problem.
The skin with the button to change the Viewstate is enclosed.

Anyone can help me? there is a way or a trick with the Action to resolve?

Thanks a lot.

Luca

[GIOLETS]

--- ehm, anyone can help me?

Thanks.

Luca

[Hopki]

Please see Issue #1145