Let's hope this all gets sorted out before 10.10 is officially released.
In the current Yosemite beta the latest Dropbox does not complete launching and at the same time kills all internet I/O. As you say, Lets hope this all gets sorted out before Yosemite is officially released.
The fact Dropbox can do this is making me reconsider using Dropbox altogether. It appears to be coming in at too low a level for my comfort.
