I typically double-click the Dropbox icon on the lower-right corner on Windows to open file explorer, but recent updates cause the first click to open the dropbox window, blocking half the icon and making it harder to double-click, see image below:
You can still double-click, but you have to be very precise with your arrow pointer by clicking on the lower half of the icon.
Another consequence of this problem is if you have your Dropbox icon in the hidden icons tray (where I keep most of mine), the window generated by a single click renders itself completely on top of the tray of icons and you can't get the second click of the double-click in.
Dropbox could fix this bug by positioning the window above the icon instead of above the taskbar. Other software is able to do this (Microsoft OneDrive, Google Backup & Sync), so Dropbox should be able to as well.
Re: Bug? Difficult to double-click Dropbox icon due to window positioning