I'm not sure if this is the right thread, otherwise you can move it.
So I'm just new at Construct 2 and bumped in my first problem. There seems to be a graphical glitch:
<img src="http://img836.imageshack.us/img836/2261/errorst.png" border="0" />
On the picture you see some black-grey lines. They aren't there in my original sprites. How can I get rid of them?