We are a drafting business sharing mostly DWG, PDF & XLS files for the last month with absolutely no problems. I have Pro Business 4 seats --- 3 seats on desktops, 1 seat on a WD-Ex2 NAS. Five days ago these problems start - - Opening a file shows a "locked" error in the SYNC panel (opening 1 files shows as 2 locked files .... opening 3 files shows as 6 locked files, etc...) - The file that is open disappears from my co-workers folder - If my coworker opens a file, it dissapears from my folder - Files re-appear after saving & closing - Syncing seems really slow What do you think could have changed?