Maybe this is a Windows issue, but I've always had the annoying problem of trying to move or delete a folder or file and for some reason the Index process is using it (scanning it? Indexing it?), usually for inordinately long periods of time so it won't let you move it.
In Ableton 11 and previous versions, you could kill the index process in the task manager but now Ableton has decided that it's a good idea to not let you shut that process down, so the only way to move some of your files is to close your project completely.
Any workaround for this?