editing or rendering the text layer will cause its layout to change solved in photoshop

Select  the text layer with a weird sign beside it, then open the Character panel. The name of the font will appear in the Font section.

The download the font and paste the ttf (or something like otf) in the fonts folder under Windows.you can install directly too.


Source:http://graphicdesign.stackexchange.com/questions/3771/how-can-i-identify-what-font-was-used-in-a-photoshop-layer-when-the-font-is-not