I've installed MiKTeX 2.9 and TeXStudio 2.4. I found suggestions on the web to change the default compiler to XeLaTeX, to provide accentuated words (I am portuguese!), to handle any type of images (pdf, eps, jpg, etc) and also to use system fonts. This seemed very interesting, as I usually use pdfLaTeX. However, when I use the fontspec package, the Inline preview of TeXStudio does not work (it gives errors). Is there any known bug or incompatibility of fontspec with inline preview?