I use Rstudio quite a lot and I work on several different projects. I keep being interrupted by an "failed to save file" error message. The Rstudio crew says this is due to the file being locked by Dropbox synching.
Beside the stopping synsching hack, the current solution is to manually exclude from synching each directory called .Rproj.user, which is tedious. What I would love to have is either to be able to exclude automatically these directories from synching or, at least, to have an option on the (Windows) context menu for excluding them with just a click.
I know that this problem is shared by many other Rstudio + Dropbox users. I imagine the same solution for file types would be appreciated by even more users.