(Resolved - not a bug) Strange graphical bug in 3.1.2 SP1

[OneDollar]

Hey there, I just came across a strange bug in AGS 3.1.2 SP1. I imported this image...
http://www.onedollarproductions.co.uk/uploads/Background.png
as a background to my room. It shows up fine in the AGS editor, but when I ran the game some of the detail on the bricks was missing - screenshot of the relevant part of the screen:
http://www.onedollarproductions.co.uk/uploads/ingame.png

The game is 640x480 32-bit, and I was importing the background over an existing one if that makes a difference. It does this windowed, full screen and in both Direct Draw and Direct 3D.

Any ideas?

[Gilbert]

Hmmm odd, but are you sure that the ingame shot is the same as the original image you posted here, as besides the brick patterns there are gray lines in the original image which didn't show up in game. Also, the ingame shot has some texture on the gray area which does not appear to be in the original image.

[OneDollar]

Ah, I've just figured out what it is - I've got objects sat on top of the background, which I hadn't updated the graphics of...

This is what happens when you start working on something after ignoring it for 3 months.

Sorry all!