Glyphs not showing up when typing in preview

Hi there!

I have been having a problem with my Glyphs, when I type in preview, the letters show up as blank, but when I select preview text they are there.

I have also exported the font to test in word and the separate glyphs also do not show up in the font file.

Is it a multiple master setup? Then make sure the glyph masters are compatible.

Are your glyphs named correctly and have Unicodes?

This is probably a font cache problem. Read this please:
http://www.glyphsapp.com/tutorials/eliminating-font-cache-problems

For testing, please use the Adobe Fonts folder:
http://www.glyphsapp.com/tutorials/testing-your-fonts-in-adobe-apps