I am working with multiple masters and the glyph thumbnails are not available for a specific master when its on the font view. I have the same master set up as an instance, however it also does not show in the preview panel to the bottom of the window. When I select this specific master, it appears empty, unlike the other masters. There is also a specific issue while typing with the text tool, where, when the text breaks, it returns to the beginning of the same line, overlapping the previous text. I am unsure if its an issue with the way I set the master up, or an error. Any help would be appreciated 
What is your UPM setting in File → Font Info… → Font?
UPM is 1200
And also check the vertical metrics settings. what do you have in the ascender and descender field in the problematic master?
Apparently I forgot to put in the ascender and descender values, thanks for the help!
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