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...you will find a small tool that makes the registry changes for you.) http://www.omnis.net/tech/notes/tndm0002/tndm0002.html Don't know how good your German is but I also have a reference to a Swiss company that uses Dataflex and had similar problems to those you describe: http://www.abacus.ch/abacus_support/technisch/multiuser/index.htm Turning off oportunistic locking and write-behind-caching has resolved almost every data corruption issue I have been confronted with. Regards Rudolf Bargholz -------------------------------------------- email: rudolf_bargholz@omnis-software.com OMNIS Software Tel:...