Happened to one directory of our clients yesterday too. After a terrible call to support, where I was told it was my network's fault (suggested to get my IT to look at it) and "educated on keeping my program updated" ( I mentioned we were afraid of updates for a good reason) all they suggested was to restore a backup. It was working fine in the morning then all the sudden several client files lost banking and payroll and we could not add a bank account. Nothing changed in that time... we didn't update anything, the error was out of the blue. What a gut punch.  Yes ...this has all reduced a grown woman to tears.  After a rough tax season we figured out many work arounds,  now there are a few clients we have to redo for a 3rd time or 4th... I've lost count.