I have two Windows systems that use Dropbox Pro. On both systems, the Dropbox items on the Explorer context menus disappeared after the Dropbox app upgraded itself to 159.4.5870.
I hadn't opened one of those systems for a few weeks: when I booted it up today, the context menu items were visible as they always have been - then Dropbox updated itself, and the context menu items disappeared, and they haven't reappeared after three reboots.
This seems to be a fairly common problem. Is there a solution?