Thanks.
There are a few images with incorrect transparency index.
Attached are fixed images.
[WARN] Image Resources/Basebits/Moray.gif (from SDL) have set incorrect transparent color index 255 instead of 0
[WARN] Image Resources/Inticon/MorayMinimized.gif (from SDL) have set incorrect transparent color index 255 instead of 0
[WARN] Image Resources/Inticon/MorayDogfight.gif (from SDL) have set incorrect transparent color index 255 instead of 0
[WARN] Image Resources/Ufopaedia/Moray_UP.gif (from SDL) have set incorrect transparent color index 255 instead of 0