Hello Laura,
Without knowing the specific steps you went through, it will be hard to ascertain what is causing the problem. To minimize the chances of losing a lot of transactions, we recommend that you retrieve and post as frequently as possible from the subidiary ledgers. We don't charge by the batch, and transactions for the next period can be safely retrieved, even if you have not finished closing the current period (assuming you are retrieving based on the date of the transaction).
I agree with Steve that the problem may well be the software between the workstation and the server. If it was a common problem we would have had many more complaints about this behaviour (who likes a crash to lose transactions!).
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Andrew Bates