Project Costing rows missing on Add Transactions in Version 9.1

We recently upgraded from version 8.9 to 9.1

In Project Costing, one of our users found a bug where while entering multiple rows on Add Transactions, if she hits the "Enter" key prior to "Save", the previously unsaved rows disappear from the visible page.  As an extension of that, if  row is entered and saved, then subsequently changed.  Striking "Enter" rather than "Save" loses the changes made.  The first couple were only a couple of rows, so rekeying is not a major undertaking.  However, we have enough instances where many rows may be created prior to saving.     Has anybody seen this either here or in other applications?  What is the solution?