It may not be the file name as the issue. I noticed that png formatted pictures did not show up in my image library, however, my jpg formatted pictures did. My best guess is that for some reason the configurations aren’t accepting the png format.
On another note, if no images are showing, go into the control panel of your webhost (i.e. mine is imhosted.com), go to the security tab, click on HotLink Protection. Either disable HotLink Proction or delete formats in the ‘blocked’ box. Chances are that is the problem. It solved it for me.
