Very strange drawing bug

Link to .capx file (required!):

dl.dropboxusercontent.com/u/41931267/VeryOddBug.capx

Steps to reproduce:

1. Run capx

2. Move around with arrow keys

Observed result:

Here's an image of the effect on my PC.

<img src="https://dl.dropboxusercontent.com/u/41931267/VeryOddBug.png" border="0" />

Basically, it seems that every tick, the main player object leaves an 'imprint' of itself on the background.

I found this issue after I accidentally deleted the background sprite in a larger project. So, I backed up the project and began to cut out everything that wasn't a part of the issue. For some reason, there is one object (I called it 'WhyDoesThisBugTheGame) that causes this issue - if I delete it, the issue remains (although the background is still strangely black. Shouldn't it be grey?)

If the issue doesn't occur for anyone else then I'll assume it's a graphics driver issue, however I'm fairly sure I'm updated.

This isn't a webgl issue either, as it also happens with webgl off.

Browsers affected:

Chrome: yes

Firefox: yes

Internet Explorer: yes

Operating system & service pack:

Windows 7 64bit

Construct 2 version:

r127 (but it definitely occurred before r127)

You've got Transparency set to YES on the Layer! <img src="smileys/smiley1.gif" border="0" align="middle" /> Someone actually wrote a game a while back that took advantage of this.

Closing as not a bug: you have a transparent layer and 'clear background' set to 'no', so you've told Construct 2 to never clear between frames.

Ashley Ah - I was confused as the removal of that other object actually fixed the problem. Sorry.