Ok I have no clue what is going on, but every image I put into the image editor, it turns blue. I had a bright orange texture, but when imported it turned bright blue. Now tried to put in a picture of the earth, but when I did It all looks like ocean, just the land is a bit lighter blue.
Do you have a mesh in the edit window unwrapped? When I unwrap a mesh with ‘U’, it usually makes a blue square over the image because the planes are stacked over the image in the editor.
This is something that occurs with each fresh startup of Blender? Could we see a screenshot of the offending color in the editor and in the 3d view with texture draw shown?
Well, I saved your image and then opened it and cropped it in Gimp and saved it as a jpeg, loaded it as an image in the editor (stayed orange) unwrapped, and then set the face as material new with texface, then hit P in object mode and it showed orange in GE. I see your file is XCF in gimp, but i guess this is just that you have the gimp file open but have exported to bitmap out - using bitmap in the editor.
Since Orange and Blue are opposites, is it possible you have a blend layer set to difference that is affecting your bitmap export? And you have tried reopening the bitmap in Gimp to rule out that the bitmap exported is blue itself?