PNG pictures dont show up

I just published a new instructable and when I click on some of the pictures its just a black square, and some of them shows a black background with white lines when it should be vise versa. 

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BrittLiv6 years ago
I've had this problem with .png files, what type of files did you use?
Jimmy Proton (author)  BrittLiv6 years ago
Yeah, these are PNG files.
Just convert them to gif's or jpg's and you problem is solved.
Jimmy Proton (author)  BrittLiv6 years ago

With a graphics program, just select a different format (usually under “save as…”). Or you could use this program:
Jimmy Proton (author)  BrittLiv6 years ago
It did nothing...
What did nothing? The program? I've never tried it, I usually use gimp or photoshop. Do you have one of them?
Jimmy Proton (author)  BrittLiv6 years ago
Yes, I was talking about the program, I copied all of my pictures that were PNG into the program and when I clicked covert they were all still PNG. What do you mean?
Thank you! I had seen this effect occasionally, but had no idea of the cause. I wonder why the PNG format causes problems?
It's a problem with the transparent background. Apparently they are being converted into gifs and the converter interprets the background as black… Non transparent .png are working fine.
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