We are using Timeslips 2016. I have windows 10, the other paralegal has Windows 8.1 and the database is on a third computer with Windows 10

I was working on generating a bill at the same time as the other paralegal was entering slips, and half of the slips she entered have disappeared. They don't show up in the bills for the clients involved, or in the Time and Expenses list, either by date or by ID - All.