I've added a CSS file as a resource to my project - works just fine. I made the mistake of editing the file using SA. First I had to unlock the file then I edited the file. So far, so good. However now *whenever* I save the project SA displays the CSS resource and I have to go find the place where I'd been before saving.
Not a big deal but irritating coming on the back of 10 hard crashes a day.
The workaround is to close the project and open it again.