For years, I have been using MS Access run-time from the Developers Toolkit to let others use databases, forms, reports and macros I've set up. On some new PCs I've added to the network the database won't open and the LDB file has a lock icon over it. No error message. Nothing happens. All PCs are using XP. Why would the LDB file lock on the same level OS on the same network where this has worked for years. The only variable is these are new PCs, but they are running XP.