When I open/save through the native Illustrator dialogue boxes, files that I have in my dropbox folders begin to download for no reason. I use SmartSync to keep my HD space optimized and this little glitch makes that impossible.
Florent S. commented
We have the same issue with every software of the creative cloud.
These softwares read the files in folder when navigating in the folder to find the location of the file we want to open or save.
Why do Adobe softwares read files we don't open ?!
Christian Castaño commented
I found a solution for this.
Go to Preferences>File Handling and Clipboard>Number of Recent Files to Display (0-30) and change the value, either 0 or 1 if you want to have the recent file screen to show at all, 0 will show you just a black screen.
This should fix the issue.