I am writing a document in Word 2010 (Windows 7) with a font I just installed. After opening the document, the font of the text looks fine. Then, when I type something new or even just scroll the document or select text, the font reverts back to Arial. Then, I can not change the font back to what I want. This random font change does not necesssarily happen right away, but usually within a minute after opening the document. I set my desired font in the "Normal" style and as the default font for the document and this does not help.
I have seen this behavior before, but I always assumend this happens because I do not have the required font installed. Yet in this case I do, so what is the reason?