Kernings are not exporting

Hi I am very new to the Glyphs so please excuse my lack of knowledge. According to the tutorial I have adjusted kernings for the particular pairs but when I export the font kernings adjustments are not there.
Thanks

How are you testing the font? Are you using the Adobe Fonts folder?
http://www.glyphsapp.com/tutorials/testing-your-fonts-in-adobe-apps

If not, then this is probably a font cache problem. Read this please:
http://www.glyphsapp.com/tutorials/eliminating-font-cache-problems