Until this week, when I clicked on Attach, I would get a finder-like window from which to select the attachment. After selecting a file, Id click on Open and get a preview of the selected file (even for .pdf's and .doc's): a small image of the first page. That way, I could check that I selected the right file (very handy). After that, I could click on Select (or some such word) and the file would be attached to the email. I have not updated OSX or TB in the interim, but now, suddenly, I no longer get the preview--when I click on Open, the file just immediately gets attached. What caused the changed behavior and how can I revert to the previous behavior?