Hello, add a jpeg file in your document and have the file-extension of this image in capitals. Hit the adobe-pdf button to convert it to pdf and you will receive an error message like the following:
---- LaTeX Error: Unknown graphics extension: .JPG. ...e____Images_modulverzeichnis\string".JPG} \end{center} Try typing <return> to proceed. If that doesn't work, type X <return> to quit. --- if you change the extension to .jpg it will work again. I am using lyx version 1.3.7-pre6 of july the 16. 2005. kind regards, martin