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a) Yes, a hub CAN go bad and work worse than before. If your hub has collision lights on it, check them out. If not, well... assume the hub is at least part of the problem (though even for such simple equipment as a SOHO switch, I would not recommend Linksys... Had many in the past, both personally and professionally, and they are not as good as other. D-link tends to be cheaper AND more reliable overall).
b) If multiple PCs are having the problem, it is likely the server. You said the inventory is a DB of some sort. Is it just a flat-file? Is it an SQL DB? If it's flat-file, have you checked the file size? Perhaps something happened (a buffer overflow or other rare occurance) during a write to the flatfile and it got hosed?
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