I'm suddenly having trouble with the appearance of Greek text in the lower bar of the source text and in using the menu which opens on a right click. The source text itself is fine (clear Greek characters) but when I select a word the Greek word which appears in the bar below is a series of boxes. Likewise when I right click on a word, the first line in the box which opens is also a series of boxes (the second line is fine - Greek font). Am I missing a font? How and where do I install it?