Spell/Grammar check with German Language Pack. When proofing, the checker switches to English--sometimes (U.K. but usually U.S.). Understand why this might happen when a paragraph contains an English...

Spell/Grammar check with German Language Pack. When proofing, the checker switches to English--sometimes (U.K. but usually U.S.). Understand why this might happen when a paragraph contains an English quote, but not in paragraphs or tables that are all in German. Additionally, when encountering English, often does not recognize language (a lesser problem, but perhaps a symptom of the German to English toggle.
Have been to the tech folks at the Microsoft Store and they are as baffled as I am.