I just experienced this problem recently at one of our sites. They are running our VFP8 SP1 app. It ocurred after they lost communication between the server and the workstation. Typically it means the network cable has a problem, a loose connection somewhere, a hub or router that drops connections, a bad port, a network card that is going bad, or the workstation is dropping the network connection periodically.
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.·`TCH
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"When the debate is lost, slander becomes the tool of the loser." - Socrates
Vita contingit, Vive cum eo. (Life Happens, Live With it.)
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"De omnibus dubitandum"