FileWatcher doesn't work with vim
Some editors (like vim) recreate the text file when saving changes. This leads to undesired behavior of FaustLive to switch to its copy of the file instead of the changed original. I don't have a solution for the Qt function used here off the top of my head but it would be great if there was one!
I don't know about Qt, but you can change Vim's behavior by adding the lines set backup and set writebackup to ~/.vim/ftplugin/dsp.vim.
@shushcat that doesn't seem to work, I'm still getting this error
Warning your file : [...].dsp was deleted. You are now working on an internal copy of this file.
And FaustLive will continue working on a copy of the file. Editing the file with other editors like gedit works as expected.