For the last few days I have been unable to attach any files to a new message in Apple Mail - either through dragging and dropping or clicking the attachments button and selecting the file. No icon in the message, no warning -- just doesn't take. This happens when trying to send a message through any of my Mail accounts including Gmail(imap), .mac and an Exchange server. Anyone have any ideas? Problem happened while I was running 10.5.1. I have since upgraded to 10.5.2 - no change.