survey question lost

I finished creating a survey but all my pictures had black backgrounds. I fixed that by enlarging the canvas in photoshop and uploaded them, deleted the bad pictures and inserted the corrected images. I saved, but then there was still black background in some, so I went through the same process and continued the next day. Now the whole question had disappeared. I recreated the question with again corrected pictures, saved, and previewed. The question had totally disappeared. This happened again. Now I am about to create that question again. What did I do wrong? 

Should I publish the unfinished survey, just to save it? There is no save function in the upper horizontal bar, actually there is, but it is not active.

Wolfgang