Extremely slow dropbox RW 8.4 Project File Sync?

This is driving me nuts! I’m not sure what is going on. A simple change to my website and the resulting Dropbox sync ( 9-hours and counting ) can be seen in the attached screen grab…

Since updating to RW 8.4 this has been going on. I am now running 8.4.1

I have changed nothing so this is either a dropbox or a RapidWeaver issue - Right?

It is a 98mb project file but again, never a problem since Dropbox save / backup was added…

Any help wold be appreciated!