Grey shades persist
I am working on a long document (30 pages, 100+ citations) and after having to wait quite long after each citation I inserted, I decided to turn off the automatically update function. After I did that, the grey shading of new citations started. However, after manually updating, those grey shades didn't disappear. Even when turning automatic update back on, they are still there. Also when exporting to pdf. I killed them now by selecting the whole document and turning the highlighting off. However it does frighten, when you keep seeing those!