Yesterday I spent some time working out how to correctly map an image to a plane, with tiling. Frustrating, but I worked it out and went to bed happy. This morning, after adding a few other objects, and without changing my original plane, I find that Blender is putting the image on UPSIDE DOWN!!! Now, I could solve this problem by opening my image in PS and saving it upside down to compensate, but what will Blender do with it tomorrow? The interface is hard enough to learn without random chaotic behaviour driving me to distraction.
EDIT: Mea culpa (my bad). Sorry, just my ignorance and incompetence. I had two versions, one works, the other doesn’t. Same settings, but not the same file.