We had a Data missing and the message center show a "Data file checksum error. Possible data corruption or modification" I contact to Waters and they inform that is it a problem that will be corrected with the implementation of a data buffer flushing on acquisition clients and LAC/E and for this reason is necessary install Service Pack H. We have installed until service pack F.We have client/server. Someone have installed Service pack H and have this problem or the problem is resolved. Give me support about this.This a a problem computer or software computer. Is coomunication,performance data handlindg or security problems. Please give me more information about this problem.